fix(ui): the size field stays within its room in the row in every language (#5634)

It reserves room for a translated "Mixed", and in Czech or French that pushed the alignment
button up to 54 pt past the Tools pane. The field is now no wider than SIZE_FIELD, and a longer
translation scrolls in it. The language test checks the size row too.

crates/ui-egui/src/panels/format_text_ui.rs

@@ -109,9 +109,10 @@ const LABEL_ICON: f32 = 22.0;
 const PRESET_LIST: f32 = 22.0;
 /// The room a number field keeps for its value ("-5.0 pt"), beside the arrow in its box.
 const NUMBER_MIN: f32 = 52.0;
-/// The size field, which reserves room for "Mixed" so it doesn't resize while typing.
-/// shortcut: measured for English "Mixed"; a longer translation widens the size row past the
-/// narrowest pane. Upgrade by having the panel report its measured row width to the pane.
+/// The size field's room in the row: English "Mixed", its margins and the 2 pt of its box. The
+/// field reserves room for "Mixed" so it doesn't resize while typing, but no more than this.
+/// shortcut: a longer translation of "Mixed" scrolls in the field. Upgrade by having the panel
+/// report its measured row width to the pane, if that reads badly.
 const SIZE_FIELD: f32 = 62.0;
 /// The least width the panel's widest rows need, which sets how narrow the Tools pane may be
 /// dragged. Size and alignment: the size field and its arrow (in their box), the swatch, the
@@ -558,7 +559,9 @@ fn font_size_input(ui: &mut egui::Ui, size: &mut f64, mixed: bool) -> bool {
         // Reserve the localized mixed label, field margins and caret without resizing while typing.
         let font = egui::TextStyle::Body.resolve(ui.style());
         let mixed_width = ui.painter().layout_no_wrap(tl!("Mixed").into(), font.clone(), ui.visuals().text_color()).size().x;
-        let width = (mixed_width + margin.sum().x + 2.0).ceil().max(40.0);
+        // Within the row's allowance, so a long translation ("Valeurs différentes") scrolls in the
+        // field rather than pushing the row past the pane.
+        let width = (mixed_width + margin.sum().x + 2.0).ceil().clamp(40.0, SIZE_FIELD - 2.0);
         let field = egui::TextEdit::singleline(&mut text)
             .id(id)
             .font(font)

crates/ui-egui/tests/it/content.rs

@@ -757,9 +757,9 @@ fn format_text_fits_the_tools_pane_at_its_narrowest() {
     }
 }
 
-/// The lists in Format text fit the narrowest Tools pane in every interface language: "Auto" in
-/// the line spacing list is the one word in them that is translated, and in German, Ukrainian or
-/// Lao it is twice as long. The font list spans the pane, so nothing may end past it.
+/// The lists and the size row in Format text fit the narrowest Tools pane in every interface
+/// language: "Auto" in the line spacing list and "Mixed" in the size field are translated, and in
+/// Czech or French they are much longer. The font list spans the pane, so nothing may end past it.
 #[test]
 fn format_text_lists_fit_the_narrowest_tools_pane_in_every_language() {
     use egui::accesskit::Role;
@@ -780,6 +780,9 @@ fn format_text_lists_fit_the_narrowest_tools_pane_in_every_language() {
         for r in &lists {
             assert!(r.right() <= font.right() + 0.5, "{}: {r:?} reaches past the font list ({font:?})", lang.code());
         }
+        // The size row too: its field reserves room for a translated "Mixed".
+        let align = h.get_by_label(pdfcraft_ui_egui::i18n::t("Alignment")).rect();
+        assert!(align.right() <= font.right() + 0.5, "{}: Alignment {align:?} reaches past the font list ({font:?})", lang.code());
     }
 }