diff --git a/crates/ui-egui/src/commands.rs b/crates/ui-egui/src/commands.rs
index c0e12d5d09..ec49944529 100644
--- a/crates/ui-egui/src/commands.rs
+++ b/crates/ui-egui/src/commands.rs
@@ -84,7 +84,9 @@ impl PdfCraftApp {
         if self.combine_showing() && matches!(spec.needs, commands::Needs::Undo | commands::Needs::Redo) {
             return self.combine_can_undo(spec.needs == commands::Needs::Undo);
         }
-        commands::is_enabled(spec, &self.session, self.active_ids().map(|(_, id)| id))
+        // Redo also takes back what Undo took in a box open on the page, with no document step.
+        (commands::is_enabled(spec, &self.session, self.active_ids().map(|(_, id)| id))
+            || spec.needs == commands::Needs::Redo && self.open_box_can_redo())
             && (spec.id != "edit.copy"
                 || self
                     .active
@@ -735,7 +737,16 @@ impl PdfCraftApp {
             if matches!(spec.id, "view.previous_view" | "view.next_view") && !self.command_enabled(spec) {
                 continue;
             }
-            if typing && !spec.in_text {
+            // A box typed into on the page (a paragraph being edited, added text) keeps Undo and
+            // Redo only while it holds typing the page doesn't have, or Redo has typing to put
+            // back; then they reach the document. ⌘⇧Z is also ⌘Z to the Undo shortcut, so a
+            // Redo the box keeps is never taken as Undo.
+            let page_box = matches!(spec.id, "edit.undo" | "edit.redo")
+                && self.page_box_focused(ctx)
+                && !self.page_typing_unapplied()
+                && !(spec.id == "edit.redo" && self.page_box_can_redo(ctx))
+                && !(spec.id == "edit.undo" && ctx.input(|i| i.modifiers.shift));
+            if typing && !spec.in_text && !page_box {
                 continue;
             }
             let Some(key) = Key::from_name(s.key) else { continue };
diff --git a/crates/ui-egui/src/content_ui.rs b/crates/ui-egui/src/content_ui.rs
index 2ac624d3fc..25dac0d969 100644
--- a/crates/ui-egui/src/content_ui.rs
+++ b/crates/ui-egui/src/content_ui.rs
@@ -66,8 +66,18 @@ pub struct TextDraft {
     /// Display space.
     pub rect: [f64; 4],
     pub text: String,
+    /// The box's formatting; its `text` is what the page has (empty for new text).
     pub style: AddedText,
     pub focus: bool,
+    /// The text the box's own Undo history starts from ([`crate::edit_text_ui::forget_typing_before`]).
+    pub typing_from: Option<String>,
+}
+
+impl TextDraft {
+    /// Typing the page doesn't have yet: Undo takes it back in the box before touching the document.
+    pub(crate) fn has_unapplied_typing(&self) -> bool {
+        self.text != self.style.text
+    }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -394,7 +404,7 @@ pub(crate) fn page_input(
             let page_width = info.pages.get(page).map_or(f64::INFINITY, |p| p.width as f64);
             let rect = [at[0], at[1] - style.size * 1.2, (at[0] + 200.0).min(page_width), at[1]];
             style.rect = rect;
-            cv.draft = Some(TextDraft { page, index: None, rect, text: String::new(), style, focus: true });
+            cv.draft = Some(TextDraft { page, index: None, rect, text: String::new(), style, focus: true, typing_from: None });
             consumed = true;
             if typed.is_some() {
                 view.pending_edit = typed;
@@ -432,7 +442,7 @@ pub(crate) fn page_input(
         if let Some(edit) = cv.finish_draft(added) {
             view.pending_edit = Some(edit);
         }
-        cv.draft = Some(TextDraft { page, index: Some(i), rect: t.rect, text: t.text.clone(), style: t.clone(), focus: true });
+        cv.draft = Some(TextDraft { page, index: Some(i), rect: t.rect, text: t.text.clone(), style: t.clone(), focus: true, typing_from: None });
         cv.selected = Some((page, i));
         consumed = true;
         return consumed;
@@ -508,6 +518,7 @@ pub(crate) fn after_refresh(view: &mut DocView, added: &[Added]) {
 /// committed (a click away, or Done), and whether Done finished adding text. Discard or Escape
 /// throws the draft away.
 pub(crate) fn editor(ctx: &egui::Context, view: &mut DocView, info: &DocInfo, added: &[Added]) -> (Option<Edit>, bool) {
+    let doc_id = view.id;
     let Some(page) = view.content.draft.as_ref().map(|d| d.page) else { return (None, false) };
     let Some(xf) = view.page_xform(page) else { return (None, false) };
     let zoom = xf.zoom();
@@ -583,6 +594,8 @@ pub(crate) fn editor(ctx: &egui::Context, view: &mut DocView, info: &DocInfo, ad
                 let job = spaced_job(text.as_str(), &font, Color32::from_rgb(cr, cg, cb), letter_spacing, wrap_width, halign);
                 ui.fonts_mut(|f| f.layout_job(job))
             };
+            let input = input_id();
+            crate::edit_text_ui::forget_typing_before(ui.ctx(), input, doc_id, &mut t.typing_from, &t.style.text);
             ui.horizontal_top(|ui| {
                 ui.spacing_mut().item_spacing.x = 4.0;
                 let mut edit = egui::TextEdit::multiline(&mut t.text)
@@ -593,7 +606,7 @@ pub(crate) fn editor(ctx: &egui::Context, view: &mut DocView, info: &DocInfo, ad
                     .background_color(if background_ready { Color32::TRANSPARENT } else { Color32::WHITE })
                     .text_color(Color32::from_rgb(cr, cg, cb))
                     .hint_text(tl!("Type text"))
-                    .id_salt("added-text-edit");
+                    .id(input);
                 if letter_spacing != 0.0 {
                     edit = edit.layouter(&mut spaced);
                 }
@@ -653,12 +666,21 @@ fn finish(cv: &mut ContentView, d: TextDraft, added: &[Added]) -> Option<Edit> {
         Some(i) => {
             let (_, a) = on_page(added, d.page).into_iter().find(|(k, _)| *k == i)?;
             let AddedContent::Text(old) = &a.content else { return None };
+            // Unchanged is no edit, even for text saved with trailing spaces the trim would drop.
+            if *old == (AddedText { text: d.text.clone(), rect: d.rect, ..d.style.clone() }) {
+                return None;
+            }
             let updated = AddedText { text, rect: d.rect, ..d.style };
             (*old != updated).then_some(Edit::UpdateContent { page: d.page, index: i, content: AddedContent::Text(updated) })
         }
     }
 }
 
+/// The added-text box's text field.
+pub(crate) fn input_id() -> egui::Id {
+    egui::Id::new("added-text-input")
+}
+
 /// How to use the tools, under the Add content list.
 pub(crate) fn hint(ui: &mut egui::Ui, t: &Tokens) {
     ui.label(
diff --git a/crates/ui-egui/src/edit_text_ui.rs b/crates/ui-egui/src/edit_text_ui.rs
index 65c7bd780a..d72931fa14 100644
--- a/crates/ui-egui/src/edit_text_ui.rs
+++ b/crates/ui-egui/src/edit_text_ui.rs
@@ -256,6 +256,33 @@ pub struct LineEditor {
     /// horizontal scale (%), and what they were.
     pub extras: Extras,
     extras0: Extras,
+    /// The text the box's own Undo history starts from; see [`forget_typing_before`].
+    typing_from: Option<String>,
+}
+
+/// The paragraph editor's text box.
+pub(crate) fn input_id() -> egui::Id {
+    egui::Id::new("edit-text-line-input")
+}
+
+/// The page text box `id` keeps its own Undo history, across every paragraph or box it has shown
+/// in every tab (they share the id). Once the page has `text` (the box opened on it, or formatting
+/// applied it), that history is cleared: Undo in the box takes back only what was typed since, and
+/// then reaches the document. Kept, it put back text from another paragraph, or the whole paragraph
+/// as it was before a format change, into a box showing the page as it is now. `from` is the box's
+/// own record of that; which document `doc` last used the history is kept beside it, since a box
+/// in another tab on the same text would otherwise take that document's typing with its Redo.
+pub(crate) fn forget_typing_before(ctx: &egui::Context, id: egui::Id, doc: pdfcraft_engine::DocId, from: &mut Option<String>, text: &str) {
+    let owner = id.with("typing-doc");
+    if from.as_deref() == Some(text) && ctx.data(|d| d.get_temp::<pdfcraft_engine::DocId>(owner)) == Some(doc) {
+        return;
+    }
+    if let Some(mut state) = egui::TextEdit::load_state(ctx, id) {
+        state.clear_undoer();
+        egui::TextEdit::store_state(ctx, id, state);
+    }
+    ctx.data_mut(|d| d.insert_temp(owner, doc));
+    *from = Some(text.to_owned());
 }
 
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -1199,6 +1226,7 @@ fn open_editor(
         family_chosen: false,
         extras: Extras::default(),
         extras0: Extras::default(),
+        typing_from: None,
     });
 }
 
@@ -1553,6 +1581,7 @@ fn editor_galley(ui: &egui::Ui, ed: &LineEditor, text: &str, scale: f32, width:
 
 /// The inline editor; returns the edit once the text is applied.
 pub(crate) fn overlay(ctx: &egui::Context, view: &mut DocView, info: &DocInfo) -> Option<Edit> {
+    let view_id = view.id;
     // Clicks outside the document (the Format text panel) keep the paragraph open.
     let outside = ctx.input(|i| i.pointer.latest_pos()).is_some_and(|p| !view.viewport_rect().contains(p));
     let page = view.line_editor.as_ref()?.page;
@@ -1668,8 +1697,10 @@ pub(crate) fn overlay(ctx: &egui::Context, view: &mut DocView, info: &DocInfo) -
                     let galley = editor_galley(ui, &snapshot, text.as_str(), scale, wrap_width);
                     if snapshot.changes_with(text.as_str()) { galley } else { unseen(galley) }
                 };
+                let input = input_id();
+                forget_typing_before(ui.ctx(), input, view_id, &mut ed.typing_from, &ed.original);
                 let output = egui::TextEdit::multiline(&mut ed.text)
-                    .id(egui::Id::new("edit-text-line-input"))
+                    .id(input)
                     .font(font.clone())
                     .margin(egui::Margin::ZERO)
                     .layouter(&mut layouter)
@@ -1801,6 +1832,7 @@ mod tests {
             family_chosen: false,
             extras: Extras::default(),
             extras0: Extras::default(),
+            typing_from: None,
         };
         (app, ed)
     }
@@ -1868,6 +1900,7 @@ mod tests {
             text: "Typed text".into(),
             style: crate::content_ui::default_style(),
             focus: true,
+            typing_from: None,
         };
         app.views[0].content.draft = Some(draft.clone());
 
diff --git a/crates/ui-egui/src/editing.rs b/crates/ui-egui/src/editing.rs
index 4f25d6df21..83c6d2d229 100644
--- a/crates/ui-egui/src/editing.rs
+++ b/crates/ui-egui/src/editing.rs
@@ -227,13 +227,36 @@ impl PdfCraftApp {
     pub fn redo(&mut self) {
         if self.combine_showing() {
             self.combine_history_step(false);
-        } else {
+        } else if !self.redo_in_page_box() {
             self.history_step(false);
         }
     }
 
+    /// Redo from the menu or toolbar while a box on the page has typing of its own: the step is
+    /// the box's, as the key's is. What Undo took back in the box comes back; typing the page
+    /// doesn't have yet stays as it is, since applying it first is a new edit, which drops the
+    /// document's Redo. True when the box took the step.
+    fn redo_in_page_box(&mut self) -> bool {
+        let Some(ctx) = self.ctx.clone() else { return false };
+        let Some(view) = self.active.and_then(|i| self.views.get_mut(i)) else { return false };
+        if let Some(ed) = view.line_editor.as_mut() {
+            let Some(text) = redo_typing(&ctx, crate::edit_text_ui::input_id(), &ed.text) else { return ed.has_unsaved_text() };
+            ed.text = text;
+            return true;
+        }
+        if let Some(d) = view.content.draft.as_mut() {
+            let Some(text) = redo_typing(&ctx, crate::content_ui::input_id(), &d.text) else { return d.has_unapplied_typing() };
+            d.text = text;
+            return true;
+        }
+        false
+    }
+
     fn history_step(&mut self, undo: bool) {
         let Some((i, id)) = self.active_ids() else { return };
+        if !self.close_text_editors(i, id) {
+            return;
+        }
         let result = if undo { self.session.undo(id) } else { self.session.redo(id) };
         match result {
             Ok(label) => {
@@ -252,6 +275,90 @@ impl PdfCraftApp {
         }
     }
 
+    /// Before Undo or Redo: a paragraph or added text box open on the page shows the document as
+    /// it is before the step, so it is applied as clicking away applies it, then closed. Left
+    /// open, it kept showing what the step took away, and wrote from it when it was next applied.
+    /// What was typed is then the step Undo takes back. False (nothing is undone, and the box
+    /// stays open) while it holds text the standard fonts can't draw, or text that couldn't be
+    /// applied: it is shown, never lost.
+    pub(crate) fn close_text_editors(&mut self, i: usize, id: pdfcraft_engine::DocId) -> bool {
+        let Some(view) = self.views.get_mut(i) else { return true };
+        if let Some(c) = view.content.blocked() {
+            view.content.hold_blocked();
+            self.notify(crate::content_ui::undrawable_message(c));
+            return false;
+        }
+        if let Some(ed) = view.line_editor.take()
+            && let Some(edit) = crate::edit_text_ui::finished_edit(ed.clone())
+            && !self.apply_edit(edit)
+        {
+            if let Some(view) = self.views.get_mut(i) {
+                view.line_editor = Some(ed);
+            }
+            return false;
+        }
+        let added = self.session.get(id).map(|d| d.added().to_vec()).unwrap_or_default();
+        let Some(view) = self.views.get_mut(i) else { return true };
+        // Finishing new text also asks for it to be selected once it exists: put that back too.
+        let (draft, select_added) = (view.content.draft.clone(), view.content.select_added);
+        if let Some(edit) = view.content.finish_draft(&added)
+            && !self.apply_edit(edit)
+        {
+            if let Some(view) = self.views.get_mut(i) {
+                (view.content.draft, view.content.select_added) = (draft, select_added);
+            }
+            return false;
+        }
+        true
+    }
+
+    /// Whether the keyboard is in a box typed into on the page: a paragraph being edited, or added
+    /// text.
+    pub(crate) fn page_box_focused(&self, ctx: &egui::Context) -> bool {
+        let focused = ctx.memory(|m| m.focused());
+        focused == Some(crate::edit_text_ui::input_id()) || focused == Some(crate::content_ui::input_id())
+    }
+
+    /// Whether the focused box on the page has typing its own Redo would put back: after Undo in
+    /// the box restores what the page has, Redo still belongs to the box, not the document. The
+    /// same test egui makes when it handles the key.
+    pub(crate) fn page_box_can_redo(&self, ctx: &egui::Context) -> bool {
+        let Some(view) = self.active.and_then(|i| self.views.get(i)) else { return false };
+        let focused = ctx.memory(|m| m.focused());
+        let (id, text) = if focused == Some(crate::edit_text_ui::input_id())
+            && let Some(ed) = &view.line_editor
+        {
+            (crate::edit_text_ui::input_id(), &ed.text)
+        } else if focused == Some(crate::content_ui::input_id())
+            && let Some(d) = &view.content.draft
+        {
+            (crate::content_ui::input_id(), &d.text)
+        } else {
+            return false;
+        };
+        has_typing_to_redo(ctx, id, text)
+    }
+
+    /// Whether the box open on the page has a Redo of its own, the step
+    /// [`Self::redo_in_page_box`] takes for Redo from the menu or toolbar: focus has moved to the
+    /// menu by then, so unlike [`Self::page_box_can_redo`] this doesn't ask for it.
+    pub(crate) fn open_box_can_redo(&self) -> bool {
+        let Some(ctx) = &self.ctx else { return false };
+        let Some(view) = self.active.and_then(|i| self.views.get(i)) else { return false };
+        if let Some(ed) = &view.line_editor {
+            return has_typing_to_redo(ctx, crate::edit_text_ui::input_id(), &ed.text);
+        }
+        view.content.draft.as_ref().is_some_and(|d| has_typing_to_redo(ctx, crate::content_ui::input_id(), &d.text))
+    }
+
+    /// Typing in a box on the page (a paragraph being edited, added text) that the page doesn't
+    /// have yet: Undo and Redo keys take it back in the box first.
+    pub(crate) fn page_typing_unapplied(&self) -> bool {
+        self.active.and_then(|i| self.views.get(i)).is_some_and(|v| {
+            v.line_editor.as_ref().is_some_and(|ed| ed.has_unsaved_text()) || v.content.draft.as_ref().is_some_and(|d| d.has_unapplied_typing())
+        })
+    }
+
     /// Apply any edit a view queued this frame (organize toolbar, keys).
     /// Returns false when a field refused the typing queued for it (its editor is open again).
     pub(crate) fn process_pending_edits(&mut self) -> bool {
@@ -1239,6 +1346,25 @@ fn bookmark_at<'a>(items: &'a [pdfcraft_render::OutlineItem], path: &[usize]) ->
     if rest.is_empty() { Some(item) } else { bookmark_at(&item.children, rest) }
 }
 
+/// Whether the page text box `id`, showing `text`, has typing its own Redo would put back: the
+/// test egui makes when it handles the key.
+fn has_typing_to_redo(ctx: &egui::Context, id: egui::Id, text: &str) -> bool {
+    egui::TextEdit::load_state(ctx, id)
+        .is_some_and(|state| state.cursor.char_range().is_some_and(|range| state.undoer().has_redo(&(range, text.to_owned()))))
+}
+
+/// The box's own Redo, as the key does it: the typing Undo took back, put back in the box's text,
+/// with the box's history and cursor moved along. None when the box has nothing to redo.
+fn redo_typing(ctx: &egui::Context, id: egui::Id, text: &str) -> Option<String> {
+    let mut state = egui::TextEdit::load_state(ctx, id)?;
+    let mut undoer = state.undoer();
+    let (range, redone) = undoer.redo(&(state.cursor.char_range()?, text.to_owned()))?.clone();
+    state.set_undoer(undoer);
+    state.cursor.set_char_range(Some(range));
+    egui::TextEdit::store_state(ctx, id, state);
+    Some(redone)
+}
+
 #[cfg(test)]
 mod tests {
     use super::{SaveTarget, is_mail_temp_copy, save_dialog_folder, write_atomically, write_atomically_syncing, write_atomically_with};
@@ -1542,6 +1668,45 @@ mod tests {
         out
     }
 
+    /// `one_page_pdf`, opening without a password, whose permissions refuse changes.
+    fn no_changes_pdf() -> Vec<u8> {
+        let mut doc = pdfcraft_cos::Document::open(std::sync::Arc::new(one_page_pdf())).unwrap();
+        let encryption = pdfcraft_cos::NewEncryption {
+            algorithm: pdfcraft_cos::Algorithm::Aes256,
+            user_password: "",
+            owner_password: "owner",
+            permissions: -1 ^ 8,
+            encrypt_metadata: true,
+            seed: [4; 32],
+        };
+        doc.set_encryption(&encryption).unwrap();
+        pdfcraft_cos::write_full(&doc, &Default::default()).unwrap()
+    }
+
+    /// Undo with a new text box open on a document that refuses changes: the box is put back as
+    /// it was. Finishing it had asked for the new item to be selected, and that request stayed
+    /// behind once the add was refused.
+    #[test]
+    fn a_refused_text_box_is_put_back_whole() {
+        let mut app = crate::PdfCraftApp::new();
+        app.set_option("language", "en").unwrap();
+        app.open_bytes("a.pdf", None, no_changes_pdf()).unwrap();
+        let style = crate::content_ui::default_style();
+        app.views[0].content.draft = Some(crate::content_ui::TextDraft {
+            page: 0,
+            index: None,
+            rect: [20.0, 20.0, 120.0, 40.0],
+            text: "Typed".into(),
+            style,
+            focus: false,
+            typing_from: None,
+        });
+        app.undo();
+        let content = &app.views[0].content;
+        assert_eq!(content.draft.as_ref().map(|d| d.text.as_str()), Some("Typed"), "the refused box stays open");
+        assert_eq!(content.select_added, None, "nothing was added to select");
+    }
+
     #[test]
     fn save_commits_the_open_text_box() {
         let dir = staging_dir("open-text-box");
@@ -1558,6 +1723,7 @@ mod tests {
             text: "Typed text".into(),
             style,
             focus: true,
+            typing_from: None,
         });
 
         assert!(app.save_active(SaveTarget::InPlace));
diff --git a/crates/ui-egui/tests/it/content.rs b/crates/ui-egui/tests/it/content.rs
index 0d7253707e..c2edfb8336 100644
--- a/crates/ui-egui/tests/it/content.rs
+++ b/crates/ui-egui/tests/it/content.rs
@@ -907,3 +907,154 @@ fn a_resized_added_picture_shows_only_at_its_new_size() {
     let pixels = h.render().unwrap();
     assert!(red(&pixels, kept) > 100 && red(&pixels, gone) == 0, "the page raster has the picture at its new size");
 }
+
+/// The same in an added text box: Redo after Undo puts the typing back in the box, and the
+/// document's own Redo stays waiting.
+#[test]
+fn redo_after_undoing_typing_in_added_text_puts_it_back() {
+    let mut h = harness();
+    let rect = [40.0, 195.0, 240.0, 210.0];
+    let text = pdfcraft_engine::AddedText { rect, text: "Reviewed".into(), ..Default::default() };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text: text.clone() }));
+    let bold = pdfcraft_engine::AddedText { bold: true, ..text };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::UpdateContent { page: 0, index: 0, content: pdfcraft_engine::AddedContent::Text(bold) }));
+    assert!(h.state_mut().execute("edit.undo"));
+    assert!(h.state_mut().execute("edit.text"));
+    h.run_steps(3);
+    let point = at(&h, 45.0, 195.0);
+    click(&mut h, point);
+    assert_eq!(h.state().views[0].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::End);
+    h.event(egui::Event::Text(" twice".into()));
+    h.run_steps(2);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed"));
+    h.key_press_modifiers(egui::Modifiers::COMMAND | egui::Modifiers::SHIFT, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed twice"), "Redo puts the typing back");
+    let s = h.state();
+    let doc = s.session.get(s.views[0].id).unwrap();
+    assert_eq!(doc.can_redo(), Some("Edit content"), "the document's Redo still waits");
+}
+
+/// Redo from the menu with retyping the page doesn't have yet in an added text box: the typing
+/// stays in the box and the document's Redo waits (closing the box first wrote the typing, which
+/// dropped that Redo). After Undo in the box, Redo from the menu puts the typing back there.
+#[test]
+fn redo_from_the_menu_with_retyping_in_the_box_keeps_the_documents_redo() {
+    let mut h = harness();
+    let rect = [40.0, 195.0, 240.0, 210.0];
+    let text = pdfcraft_engine::AddedText { rect, text: "Reviewed".into(), ..Default::default() };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text: text.clone() }));
+    let bold = pdfcraft_engine::AddedText { bold: true, ..text };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::UpdateContent { page: 0, index: 0, content: pdfcraft_engine::AddedContent::Text(bold) }));
+    assert!(h.state_mut().execute("edit.undo"));
+    assert!(h.state_mut().execute("edit.text"));
+    h.run_steps(3);
+    let point = at(&h, 45.0, 195.0);
+    click(&mut h, point);
+    assert_eq!(h.state().views[0].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::End);
+    h.event(egui::Event::Text(" twice".into()));
+    h.run_steps(2);
+    assert!(h.state_mut().execute("edit.redo"));
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed twice"), "the typing stays in the box");
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed"), "Undo takes it back in the box");
+    assert!(h.state_mut().execute("edit.redo"));
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed twice"), "Redo from the menu puts it back");
+    let s = h.state();
+    assert_eq!(s.session.get(s.views[0].id).unwrap().can_redo(), Some("Edit content"), "the document's Redo still waits");
+}
+
+/// Redo from the menu after Undo in an added text box, with nothing for the document to redo: the
+/// menu item follows the box's own Redo too, and puts the typing back.
+#[test]
+fn redo_from_the_menu_is_enabled_for_the_added_text_boxs_own_typing() {
+    let mut h = harness();
+    let rect = [40.0, 195.0, 240.0, 210.0];
+    let text = pdfcraft_engine::AddedText { rect, text: "Reviewed".into(), ..Default::default() };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text }));
+    assert!(h.state_mut().execute("edit.text"));
+    h.run_steps(3);
+    let point = at(&h, 45.0, 195.0);
+    click(&mut h, point);
+    assert_eq!(h.state().views[0].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::End);
+    h.event(egui::Event::Text(" twice".into()));
+    h.run_steps(2);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed"), "Undo takes it back in the box");
+    assert_eq!(h.state().session.get(h.state().views[0].id).unwrap().can_redo(), None, "the document has nothing to redo");
+    assert!(h.state_mut().execute("edit.redo"), "Redo is enabled for the box's own step");
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed twice"), "Redo puts it back");
+}
+
+/// Redo with an added text box open and unchanged reaches the document's waiting Redo, even when
+/// the box's text ends in a space: closing the unchanged box writes nothing, so it can't clear
+/// that Redo first.
+#[test]
+fn redo_with_an_unchanged_box_open_redoes_the_document() {
+    let mut h = harness();
+    let rect = [40.0, 195.0, 240.0, 210.0];
+    let text = pdfcraft_engine::AddedText { rect, text: "Reviewed ".into(), ..Default::default() };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text }));
+    let pdfcraft_engine::AddedContent::Text(saved) = added(&h)[0].content.clone() else { panic!() };
+    assert_eq!(saved.text, "Reviewed ", "the trailing space is kept");
+    let bold = pdfcraft_engine::AddedText { bold: true, ..saved };
+    assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::UpdateContent { page: 0, index: 0, content: pdfcraft_engine::AddedContent::Text(bold) }));
+    assert!(h.state_mut().execute("edit.undo"));
+    assert!(h.state_mut().execute("edit.text"));
+    h.run_steps(3);
+    let point = at(&h, 45.0, 195.0);
+    click(&mut h, point);
+    assert_eq!(h.state().views[0].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    h.key_press_modifiers(egui::Modifiers::COMMAND | egui::Modifiers::SHIFT, egui::Key::Z);
+    h.run_steps(4);
+    let pdfcraft_engine::AddedContent::Text(now) = &added(&h)[0].content else { panic!() };
+    assert!(now.bold, "the waiting Redo was redone");
+    assert!(h.state().views[0].content.draft.is_none(), "the box closed with the step");
+}
+
+/// Two copies of a document, the same added text open in each: the boxes share one Undo history,
+/// so typing taken back with Undo in one tab came back with Redo in the other.
+#[test]
+fn typing_in_one_tab_never_reaches_another_tabs_added_text() {
+    let mut h = harness();
+    h.state_mut().open_bytes("copy.pdf", None, include_bytes!("../data/form.pdf").to_vec()).unwrap();
+    h.run_steps(4);
+    let text = pdfcraft_engine::AddedText { rect: [40.0, 195.0, 240.0, 210.0], text: "Reviewed".into(), ..Default::default() };
+    let open_in = |h: &mut Harness<'static, PdfCraftApp>, tab: usize| {
+        h.state_mut().active = Some(tab);
+        h.run_steps(2);
+        assert!(h.state_mut().execute("edit.text"));
+        h.run_steps(3);
+        let r = h.state().views[tab].page_screen_rect(0).expect("on screen");
+        let k = r.width() / 300.0;
+        click(h, r.min + egui::vec2(45.0 * k, 195.0 * k));
+        assert_eq!(h.state().views[tab].content.draft.as_ref().and_then(|d| d.index), Some(0), "the editor opened on the text");
+    };
+    for tab in [0, 1] {
+        h.state_mut().active = Some(tab);
+        assert!(h.state_mut().apply_edit(pdfcraft_engine::Edit::AddText { page: 0, text: text.clone() }));
+    }
+    open_in(&mut h, 1);
+    open_in(&mut h, 0);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::End);
+    h.event(egui::Event::Text(" secret".into()));
+    h.run_steps(2);
+    h.key_press_modifiers(egui::Modifiers::COMMAND, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed"), "taken back");
+    h.state_mut().active = Some(1);
+    h.run_steps(3);
+    h.key_press_modifiers(egui::Modifiers::COMMAND | egui::Modifiers::SHIFT, egui::Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[1].content.draft.as_ref().map(|d| d.text.as_str()), Some("Reviewed"), "the other tab's typing stays out");
+}
diff --git a/crates/ui-egui/tests/it/editing.rs b/crates/ui-egui/tests/it/editing.rs
index a6523184a9..65bfb37ae0 100644
--- a/crates/ui-egui/tests/it/editing.rs
+++ b/crates/ui-egui/tests/it/editing.rs
@@ -6466,6 +6466,194 @@ fn mode_tabs_keep_the_hand_over_a_paragraph_scrolled_under_them() {
     assert_eq!(h.state().mode, pdfcraft_ui_egui::Mode::Convert, "the tab takes the click, not the paragraph's editor");
 }
 
+/// The paragraph opened for typing, as a person opens it: a click on its text.
+fn open_paragraph(h: &mut Harness<'static, PdfCraftApp>) {
+    let r = h.state().views[0].page_screen_rect(0).expect("on screen");
+    let at = egui::pos2(r.left() + 40.0 / 200.0 * r.width(), r.top() + (300.0 - 158.0) / 300.0 * r.height());
+    click_at(h, at);
+    assert!(h.state().views[0].line_editor.is_some(), "the paragraph opens for typing");
+}
+
+/// Ctrl+Z after a formatting change, with the paragraph still open: the change is undone and
+/// the editor closes. The box's own Undo used to take the key, putting back the text it had
+/// before the change into a box laid out for the page after it, and the document kept the change.
+#[test]
+fn undo_with_the_paragraph_open_undoes_the_formatting() {
+    let mut h = harness(1, |_| {});
+    assert!(h.state_mut().execute("edit.edit_text"));
+    h.run_steps(2);
+    open_paragraph(&mut h);
+    h.get_by_label("Bold").click();
+    h.run_steps(4);
+    {
+        let s = h.state();
+        let doc = s.session.get(s.views[0].id).unwrap();
+        assert_eq!(doc.can_undo(), Some("Edit text"));
+        assert_eq!(doc.text_blocks(0)[0].base_font, "Helvetica-Bold");
+        assert!(s.views[0].line_editor.is_some(), "still editing");
+    }
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(4);
+    let s = h.state();
+    let doc = s.session.get(s.views[0].id).unwrap();
+    assert_eq!(doc.can_undo(), None, "the formatting is undone");
+    assert_eq!(doc.text_blocks(0)[0].base_font, "Helvetica");
+    assert!(s.views[0].line_editor.is_none(), "the editor closed with the step it showed");
+}
+
+/// Undo while typing takes back the typing in the box first; the document is left alone.
+#[test]
+fn undo_while_typing_takes_back_the_typing_first() {
+    let mut h = harness(1, |_| {});
+    assert!(h.state_mut().execute("edit.edit_text"));
+    h.run_steps(2);
+    open_paragraph(&mut h);
+    let original = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::End);
+    h.event(egui::Event::Text(" more".into()));
+    h.run_steps(2);
+    assert_ne!(h.state().views[0].line_editor.as_ref().unwrap().text, original);
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(3);
+    let s = h.state();
+    let ed = s.views[0].line_editor.as_ref().expect("still typing");
+    assert_eq!(ed.text, original, "the typing is taken back");
+    assert_eq!(s.session.get(s.views[0].id).unwrap().can_undo(), None, "the document is untouched");
+}
+
+/// Redo after Undo in the box puts the typing back, in the box: it doesn't reach the document,
+/// whose own Redo (a formatting change waiting here) must stay waiting.
+#[test]
+fn redo_after_undoing_typing_puts_the_typing_back() {
+    let mut h = harness(1, |_| {});
+    assert!(h.state_mut().execute("edit.edit_text"));
+    h.run_steps(2);
+    open_paragraph(&mut h);
+    h.get_by_label("Bold").click();
+    h.run_steps(4);
+    // Undo the bold (closing the editor), so the document has it to redo.
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(4);
+    assert_eq!(h.state().session.get(h.state().views[0].id).unwrap().can_redo(), Some("Edit text"));
+    open_paragraph(&mut h);
+    let original = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::End);
+    h.event(egui::Event::Text(" more".into()));
+    h.run_steps(2);
+    let typed = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].line_editor.as_ref().unwrap().text, original, "the typing is taken back");
+    h.key_press_modifiers(Modifiers::COMMAND | Modifiers::SHIFT, Key::Z);
+    h.run_steps(3);
+    let s = h.state();
+    let ed = s.views[0].line_editor.as_ref().expect("still typing");
+    assert_eq!(ed.text, typed, "Redo puts the typing back");
+    let doc = s.session.get(s.views[0].id).unwrap();
+    assert_eq!((doc.can_redo(), doc.text_blocks(0)[0].base_font.as_str()), (Some("Edit text"), "Helvetica"), "the document's Redo still waits");
+}
+
+/// Redo from the menu or toolbar with typing in the box the page doesn't have yet. Closing the
+/// box first applied the typing, a new edit that dropped the document's waiting Redo, and the
+/// Redo itself then failed: the step was gone. The typing now stays in the box and the Redo
+/// waits; once Undo in the box takes the typing back, Redo from the menu puts it back there.
+#[test]
+fn redo_from_the_menu_with_typing_in_the_box_keeps_the_documents_redo() {
+    let mut h = harness(1, |_| {});
+    assert!(h.state_mut().execute("edit.edit_text"));
+    h.run_steps(2);
+    open_paragraph(&mut h);
+    h.get_by_label("Bold").click();
+    h.run_steps(4);
+    // Undo the bold (closing the editor), so the document has it to redo.
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(4);
+    open_paragraph(&mut h);
+    let original = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::End);
+    h.event(egui::Event::Text(" more".into()));
+    h.run_steps(2);
+    let typed = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    assert!(h.state_mut().execute("edit.redo"));
+    h.run_steps(3);
+    {
+        let s = h.state();
+        let ed = s.views[0].line_editor.as_ref().expect("the box stays open");
+        assert_eq!(ed.text, typed, "the typing stays in the box, unapplied");
+        let doc = s.session.get(s.views[0].id).unwrap();
+        assert_eq!((doc.can_redo(), doc.text_blocks(0)[0].base_font.as_str()), (Some("Edit text"), "Helvetica"), "the document's Redo still waits");
+    }
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].line_editor.as_ref().unwrap().text, original, "Undo takes the typing back in the box");
+    assert!(h.state_mut().execute("edit.redo"));
+    h.run_steps(3);
+    let s = h.state();
+    assert_eq!(s.views[0].line_editor.as_ref().expect("still open").text, typed, "Redo from the menu puts the typing back");
+    assert_eq!(s.session.get(s.views[0].id).unwrap().can_redo(), Some("Edit text"), "the document's Redo still waits");
+}
+
+/// Redo from the menu after Undo in the box took the typing back, with nothing for the document
+/// to redo: the menu item follows the box's own Redo too, and puts the typing back. It was
+/// disabled, as it followed only the document's Redo, and only the key could do it.
+#[test]
+fn redo_from_the_menu_is_enabled_for_the_boxs_own_typing() {
+    let mut h = harness(1, |_| {});
+    assert!(h.state_mut().execute("edit.edit_text"));
+    h.run_steps(2);
+    open_paragraph(&mut h);
+    let original = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::End);
+    h.event(egui::Event::Text(" more".into()));
+    h.run_steps(2);
+    let typed = h.state().views[0].line_editor.as_ref().unwrap().text.clone();
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].line_editor.as_ref().unwrap().text, original, "the typing is taken back");
+    assert_eq!(h.state().session.get(h.state().views[0].id).unwrap().can_redo(), None, "the document has nothing to redo");
+    assert!(h.state_mut().execute("edit.redo"), "Redo is enabled for the box's own step");
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].line_editor.as_ref().expect("still open").text, typed, "Redo puts the typing back");
+}
+
+/// Two copies of a document, the same paragraph open in each. The paragraph boxes share one text
+/// box, and so one Undo history: a box opened on the same text as another tab's didn't clear it.
+/// Typing in one tab, taken back with Undo, then came back with Redo in the other tab.
+#[test]
+fn typing_in_one_tab_never_reaches_another_tabs_paragraph() {
+    let mut h = harness(1, |app| {
+        app.open_bytes("copy.pdf", None, fixture(1)).expect("the copy opens");
+    });
+    let open_in = |h: &mut Harness<'static, PdfCraftApp>, tab: usize| {
+        h.state_mut().active = Some(tab);
+        h.run_steps(2);
+        assert!(h.state_mut().execute("edit.edit_text"));
+        h.run_steps(2);
+        let r = h.state().views[tab].page_screen_rect(0).expect("on screen");
+        click_at(h, egui::pos2(r.left() + 40.0 / 200.0 * r.width(), r.top() + (300.0 - 158.0) / 300.0 * r.height()));
+        assert!(h.state().views[tab].line_editor.is_some(), "the paragraph opens for typing");
+    };
+    open_in(&mut h, 1);
+    let original = h.state().views[1].line_editor.as_ref().unwrap().text.clone();
+    open_in(&mut h, 0);
+    assert_eq!(h.state().views[0].line_editor.as_ref().unwrap().text, original, "the same paragraph");
+    h.key_press_modifiers(Modifiers::COMMAND, Key::End);
+    h.event(egui::Event::Text(" secret".into()));
+    h.run_steps(2);
+    h.key_press_modifiers(Modifiers::COMMAND, Key::Z);
+    h.run_steps(3);
+    assert_eq!(h.state().views[0].line_editor.as_ref().unwrap().text, original, "taken back");
+    // The copy, its paragraph still open: Redo there has nothing of its own to put back.
+    h.state_mut().active = Some(1);
+    h.run_steps(3);
+    h.key_press_modifiers(Modifiers::COMMAND | Modifiers::SHIFT, Key::Z);
+    h.run_steps(3);
+    let s = h.state();
+    let text = s.views[1].line_editor.as_ref().map(|ed| ed.text.clone());
+    assert!(!text.as_deref().unwrap_or_default().contains("secret"), "the other tab's typing came in: {text:?}");
+    assert_eq!(s.session.get(s.views[1].id).unwrap().text_blocks(0)[0].text, s.session.get(s.views[0].id).unwrap().text_blocks(0)[0].text);
+}
+
 /// A paragraph selected by its frame goes with one Delete (or Backspace), as in Acrobat, instead
 /// of being emptied a typed character at a time, and undo brings it back.
 #[test]