M4: superscript and subscript are synthesised where the font has no glyphs for them (#1828) (#1868)

* M4: superscript and subscript are synthesised where the font has no glyphs for them (#1828)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

* Text: a zero OS/2 script offset counts as unset, and the native-glyph check sees the case-mapped characters

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

---------

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>

crates/engine/src/text_behaviour_tests.rs

@@ -399,6 +399,46 @@ fn max_lines_on_auto_width_text_keeps_auto_width_and_hugs_that_many_lines() {
     assert_eq!(size(&s, t).1, 72.0);
 }
 
+#[test]
+fn superscript_and_subscript_are_synthesised_without_glyphs_for_them() {
+    // "If it isn't provided, Figma draws a synthesized version by using the font's standard
+    // version of the character, shrinking it, and positioning it accordingly" (Explore text
+    // properties). The synthetic font has no sups or subs feature and no OS/2 metrics, so the
+    // usual 0.65 em at 0.35 em up (superscript) or 0.14 em down (subscript) apply.
+    let font = test_mono_font();
+    let mut s = Session::new();
+    let t = text(&mut s, "x2", json!({"fontFamily": font, "fontSize": 40}));
+    let glyphs = |s: &Session| -> Vec<(f64, f64, f64)> {
+        let (l, _) = figcraft_text::layout_node(s.doc().unwrap().node(t).unwrap()).unwrap();
+        l.glyphs.iter().map(|g| (g.size, g.y, g.advance)).collect()
+    };
+    let plain = glyphs(&s);
+    assert_eq!(plain.len(), 2);
+    assert_eq!((plain[0].0, plain[0].2), (40.0, 20.0));
+    assert_eq!(size(&s, t).0, 40.0);
+    s.execute("text.setFeatures", &json!({"ids": [t], "features": {"sups": true}})).unwrap();
+    let sup = glyphs(&s);
+    for (g, p) in sup.iter().zip(&plain) {
+        assert!((g.0 - 26.0).abs() < 1e-6 && (g.2 - 13.0).abs() < 1e-6, "shrunk to 0.65 em, the advance with it: {g:?}");
+        assert!((p.1 - g.1 - 14.0).abs() < 1e-6, "raised 0.35 em: {g:?} against {p:?}");
+    }
+    assert!((size(&s, t).0 - 26.0).abs() < 1e-6, "the auto-width box hugs the smaller glyphs: {:?}", size(&s, t));
+    s.execute("text.setFeatures", &json!({"ids": [t], "features": {"sups": null, "subs": true}})).unwrap();
+    let sub = glyphs(&s);
+    for (g, p) in sub.iter().zip(&plain) {
+        assert!((g.0 - 26.0).abs() < 1e-6 && (g.1 - p.1 - 5.6).abs() < 1e-6, "shrunk, and lowered 0.14 em: {g:?} against {p:?}");
+    }
+    // Capitalised, the same: the synthesis follows the characters shaping saw.
+    s.execute("node.set", &json!({"id": t, "props": {"textCase": "upper"}})).unwrap();
+    s.execute("text.setFeatures", &json!({"ids": [t], "features": {"subs": null, "sups": true}})).unwrap();
+    for (g, p) in glyphs(&s).iter().zip(&plain) {
+        assert!((g.0 - 26.0).abs() < 1e-6 && (p.1 - g.1 - 14.0).abs() < 1e-6, "upper case, superscript: {g:?} against {p:?}");
+    }
+    s.execute("node.set", &json!({"id": t, "props": {"textCase": "original"}})).unwrap();
+    s.execute("text.setFeatures", &json!({"ids": [t], "features": {"sups": null, "subs": false}})).unwrap();
+    assert_eq!(glyphs(&s), plain, "off again");
+}
+
 /// A synthetic monospaced TrueType font (outline-less glyphs, every printable ASCII character 500 of
 /// 1000 units wide), loaded into the font database so text measures the same on every machine.
 fn test_mono_font() -> &'static str {

crates/text/src/fontdb.rs

@@ -102,6 +102,11 @@ pub struct Face {
     pub underline_pos: f64,
     pub underline_thickness: f64,
     pub strike_pos: f64,
+    /// Synthesised superscript and subscript (the OS/2 table's values, or the usual ones without
+    /// it): the glyph size as a fraction of the em, and the baseline shift up in font units
+    /// (negative for a subscript, which sits below).
+    pub superscript: (f64, f64),
+    pub subscript: (f64, f64),
     pub shaper: harfrust::ShaperData,
     /// OpenType GSUB feature tags the face provides (e.g. `smcp`).
     gsub_features: Vec<[u8; 4]>,
@@ -179,6 +184,17 @@ impl Face {
         let colr = has_table(b"COLR");
         let under = m.underline.map(|d| (f64::from(d.offset), f64::from(d.thickness))).unwrap_or((-upem * 0.1, upem * 0.06));
         let strike = m.strikeout.map(|d| f64::from(d.offset)).unwrap_or(ascent * 0.3);
+        // Superscript and subscript sizes and offsets: the OS/2 table's, else the usual 0.65 em,
+        // 0.35 em up and 0.14 em down (what common fonts carry); a zero counts as unset, as some
+        // fonts leave these fields.
+        let os2 = f.os2().ok();
+        let script = |size: Option<i16>, offset: Option<i16>, up: bool, usual_offset: f64| -> (f64, f64) {
+            let size = size.map(f64::from).filter(|v| *v > 0.0).map_or(0.65, |v| v / upem);
+            let offset = offset.map(f64::from).filter(|v| *v != 0.0).unwrap_or(usual_offset * upem);
+            (size, if up { offset } else { -offset })
+        };
+        let superscript = script(os2.as_ref().map(|t| t.y_superscript_y_size()), os2.as_ref().map(|t| t.y_superscript_y_offset()), true, 0.35);
+        let subscript = script(os2.as_ref().map(|t| t.y_subscript_y_size()), os2.as_ref().map(|t| t.y_subscript_y_offset()), false, 0.14);
         let weight = {
             let w = attrs.weight.value();
             if w.is_finite() && w > 0.0 { w.round() as u16 } else { figcraft_doc::style_weight(&style) }
@@ -200,6 +216,8 @@ impl Face {
             underline_pos: under.0,
             underline_thickness: under.1.max(upem * 0.02),
             strike_pos: strike,
+            superscript,
+            subscript,
             shaper,
             gsub_features,
             track,

crates/text/src/layout.rs

@@ -1418,39 +1418,65 @@ fn shape_segment(chars: &[char], seg: &Segment, face: &Arc<Face>, features: &[Fe
     // Variable fonts: the axis values the style asks for (named instance, implied weight, custom).
     let values = face.axis_values(style);
     let coords = face.coords(&values);
-    let mut raw: Vec<(u32, u32, i32, i32, i32)> = Vec::new();
-    if let Some(hb) = face.hb() {
-        let instance = (!coords.is_empty()).then(|| {
-            let vars = face
-                .axes
-                .iter()
-                .zip(&values)
-                .filter_map(|(a, v)| <[u8; 4]>::try_from(a.tag.as_bytes()).ok().map(|t| Variation { tag: Tag::new(&t), value: *v as f32 }));
-            ShaperInstance::from_variations(&hb, vars)
-        });
-        let shaper = face.shaper.shaper(&hb).instance(instance.as_ref()).build();
-        let mut buf = UnicodeBuffer::new();
-        for (u, src, _) in &mapped {
-            buf.add(*u, *src as u32);
-        }
-        let rtl = seg.level % 2 == 1;
-        buf.set_direction(if rtl { Direction::RightToLeft } else { Direction::LeftToRight });
-        buf.guess_segment_properties();
-        let gb = shaper.shape(buf, ShapeOptions::new().features(&feats));
-        for (info, pos) in gb.glyph_infos().iter().zip(gb.glyph_positions()) {
-            raw.push((info.glyph_id, info.cluster, pos.x_advance, pos.x_offset, pos.y_offset));
-        }
-        // Right-to-left glyphs come out in visual order; items are kept in logical order (lines
-        // put runs back in visual order).
-        if rtl {
-            raw.reverse();
-        }
-    } else {
-        for (u, src, _) in &mapped {
-            let gid = face.glyph_for(*u);
-            raw.push((gid, *src as u32, face.advance_at(gid, &coords) as i32, 0, 0));
+    let shape = |feats: &[Feature]| -> Vec<(u32, u32, i32, i32, i32)> {
+        let mut raw = Vec::new();
+        if let Some(hb) = face.hb() {
+            let instance = (!coords.is_empty()).then(|| {
+                let vars = face
+                    .axes
+                    .iter()
+                    .zip(&values)
+                    .filter_map(|(a, v)| <[u8; 4]>::try_from(a.tag.as_bytes()).ok().map(|t| Variation { tag: Tag::new(&t), value: *v as f32 }));
+                ShaperInstance::from_variations(&hb, vars)
+            });
+            let shaper = face.shaper.shaper(&hb).instance(instance.as_ref()).build();
+            let mut buf = UnicodeBuffer::new();
+            for (u, src, _) in &mapped {
+                buf.add(*u, *src as u32);
+            }
+            let rtl = seg.level % 2 == 1;
+            buf.set_direction(if rtl { Direction::RightToLeft } else { Direction::LeftToRight });
+            buf.guess_segment_properties();
+            let gb = shaper.shape(buf, ShapeOptions::new().features(feats));
+            for (info, pos) in gb.glyph_infos().iter().zip(gb.glyph_positions()) {
+                raw.push((info.glyph_id, info.cluster, pos.x_advance, pos.x_offset, pos.y_offset));
+            }
+            // Right-to-left glyphs come out in visual order; items are kept in logical order
+            // (lines put runs back in visual order).
+            if rtl {
+                raw.reverse();
+            }
+        } else {
+            for (u, src, _) in &mapped {
+                let gid = face.glyph_for(*u);
+                raw.push((gid, *src as u32, face.advance_at(gid, &coords) as i32, 0, 0));
+            }
         }
+        raw
+    };
+    let mut raw = shape(&feats);
+    // Superscript or subscript (`sups` / `subs` on the node): the face's own glyphs where it has
+    // the feature and every letter or digit here got one; otherwise synthesised from the standard
+    // glyphs, shrunk and shifted ("Figma draws a synthesized version by using the font's standard
+    // version of the character, shrinking it, and positioning it accordingly"; a run mixing
+    // available and unavailable glyphs is synthesised whole, "for consistency").
+    let script = [(b"sups", true), (b"subs", false)].into_iter().find(|(tag, _)| feats.iter().any(|f| f.tag == Tag::new(tag) && f.value != 0));
+    // The glyph a cluster's character has on its own, after the case mapping shaping saw.
+    let plain_gid = |cl: usize| mapped.iter().find(|(_, src, _)| *src == cl).map(|(u, _, _)| face.glyph_for(*u));
+    let unchanged = |raw: &[(u32, u32, i32, i32, i32)]| {
+        raw.iter().any(|&(gid, cl, ..)| {
+            let cl = cl as usize;
+            chars.get(cl).is_some_and(|c| c.is_alphanumeric()) && plain_gid(cl) == Some(gid)
+        })
+    };
+    let synth = script.filter(|(tag, _)| !face.has_feature(tag) || unchanged(&raw));
+    if let Some((tag, _)) = synth
+        && face.has_feature(tag)
+    {
+        let plain: Vec<Feature> = feats.iter().filter(|f| f.tag != Tag::new(tag)).cloned().collect();
+        raw = shape(&plain);
     }
+    let (script_scale, script_shift) = synth.map_or((1.0, 0.0), |(_, up)| if up { face.superscript } else { face.subscript });
     let n = raw.len();
     for gi in 0..n {
         let Some(&(gid, cl, xa, xo, yo)) = raw.get(gi) else { continue };
@@ -1459,7 +1485,7 @@ fn shape_segment(chars: &[char], seg: &Segment, face: &Arc<Face>, features: &[Fe
         let cend = raw.iter().skip(gi + 1).map(|r| r.1 as usize).find(|c| *c > cl).unwrap_or(end).max(cl + 1);
         let last_in_cluster = raw.get(gi + 1).is_none_or(|r| r.1 as usize != cl);
         let ch = chars.get(cl).copied().unwrap_or(' ');
-        let scale = if small_at(cl) { SMALL_CAP_SCALE } else { 1.0 };
+        let scale = if small_at(cl) { SMALL_CAP_SCALE } else { 1.0 } * script_scale;
         let spacing = if last_in_cluster { seg.spacing * (cend - cl) as f64 } else { 0.0 };
         // The glyph's own advance and what shaping added to it (kerning) each land on the grid.
         let own = face.advance_at(gid, &coords);
@@ -1472,7 +1498,7 @@ fn shape_segment(chars: &[char], seg: &Segment, face: &Arc<Face>, features: &[Fe
             adv,
             spacing,
             dx: f64::from(xo) * k * scale,
-            dy: f64::from(yo) * k * scale,
+            dy: f64::from(yo) * k * scale + script_shift * k,
             char_start: cl,
             char_end: cend,
             style: seg.st_idx,

crates/text/src/tests.rs

@@ -157,6 +157,49 @@ fn small_caps_native_or_synthesised() {
     assert_eq!(sc.glyphs.iter().find(|g| g.char_start == 0).unwrap().gid, face.glyph_for('A'));
 }
 
+#[test]
+fn superscript_native_or_synthesised_and_never_mixed() {
+    // "Figma tries to use any superscript/subscript glyphs provided by the font. If it isn't
+    // provided, Figma draws a synthesized version by using the font's standard version of the
+    // character, shrinking it, and positioning it accordingly." and a layer mixing both "will all
+    // update to the synthesized form for consistency" (Explore text properties).
+    let Some(face) = inter() else { return };
+    let mut t = TextData::new("x2");
+    t.style.font_size = 20.0;
+    let plain = layout(&t, None, None);
+    t.features.insert("sups".into(), true);
+    let sup = layout(&t, None, None);
+    let at = |l: &TextLayout, i: usize| l.glyphs.iter().find(|g| g.char_start == i).cloned().unwrap();
+    let native = |i: usize| at(&sup, i).gid != at(&plain, i).gid && (at(&sup, i).size - 20.0).abs() < 1e-9;
+    let synthesised = |i: usize| at(&sup, i).gid == at(&plain, i).gid && at(&sup, i).size < 20.0 && at(&sup, i).y < at(&plain, i).y;
+    assert!((native(0) && native(1)) || (synthesised(0) && synthesised(1)), "both glyphs the same way: {:?} {:?}", at(&sup, 0), at(&sup, 1));
+    if !face.has_feature(b"sups") {
+        assert!(synthesised(0) && synthesised(1), "no sups in the face: synthesised");
+    }
+    t.features.insert("sups".into(), false);
+    t.features.insert("subs".into(), true);
+    let sub = layout(&t, None, None);
+    let g = at(&sub, 1);
+    let p = at(&plain, 1);
+    assert!((g.gid != p.gid && (g.size - 20.0).abs() < 1e-9) || (g.size < 20.0 && g.y > p.y), "subscript: native, or shrunk and lowered: {g:?}");
+    // Capitalised, the same holds: the check against the face's own glyphs sees the characters
+    // shaping saw (an X, not an x), so a face with a superscript 2 and no superscript X
+    // synthesises both rather than mixing them.
+    t.features.clear();
+    t.style.case = figcraft_doc::TextCase::Upper;
+    let plain_up = layout(&t, None, None);
+    t.features.insert("sups".into(), true);
+    let up = layout(&t, None, None);
+    let native_up = |i: usize| at(&up, i).gid != at(&plain_up, i).gid && (at(&up, i).size - 20.0).abs() < 1e-9;
+    let synth_up = |i: usize| at(&up, i).gid == at(&plain_up, i).gid && at(&up, i).size < 20.0 && at(&up, i).y < at(&plain_up, i).y;
+    assert!(
+        (native_up(0) && native_up(1)) || (synth_up(0) && synth_up(1)),
+        "upper case: both glyphs the same way: {:?} {:?}",
+        at(&up, 0),
+        at(&up, 1)
+    );
+}
+
 #[test]
 fn title_case_across_runs() {
     let Some(face) = inter() else { return };

docs/ui-parity.md

@@ -1,6 +1,6 @@
 # UI and interaction parity
 
-> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-02 · **Change:** patch (Backspace or Delete at the start of a list item keeps the item's indentation level, as the lists article says; max lines on auto-width text keep it auto width, hugging that many lines, as the text properties article says; the interface size keys of the help center's accessibility page: Cmd/Ctrl+Shift+Alt with =, - and 0 step the interface through the Preferences sizes and back to the system's size; Cmd/Ctrl+Alt+arrows rotate the selection a degree at a time, 15 with Shift, as the help center's accessibility page says; they resized before; the Layers panel answers Ctrl+1 as well as Alt+1 on Windows and Linux, the two keys the help center gives it; the colour picker's Image tab shows a placeholder and Upload from computer, an asset preview, and a file dropped on it replaces the image, keeping the fill mode, crop and position (#1682); the keyboard's Menu key opens the context menu, as Shift+F10 does; the eyedropper with Cmd/Ctrl+Shift makes a colour style or variable of what it picks; sidebar number and text fields keep their text vertically centered when focused, including typography spacing; with the pen out, Enter or a double-click ends the path and edits the vector with the Move tool instead of drawing on (#1430); the Actions palette offers only commands that run from it, and no second row reading like a menu item: Place image opens the file dialog (#1574); Preferences ▸ Scroll wheel zoom: a mouse wheel zooms the canvas about the pointer and Cmd/Ctrl+wheel scrolls (#1390); boolean operations refuse input past their caps, and a boolean group past them draws without its result (#1104); the selection and hover outlines of rounded rectangles and frames follow their corners (#1506); colour picker review fixes for text undo, fitted sidebars, moving controls and gradient variables; Corner smoothing: an original icon and the shared number-field drag gesture, preserving fractional baselines; guides snap to layers when dragged; Crop image: Object ▸ Crop image, the right-click menu and the image fill row enter crop mode (`image.crop`, #1464); the Design panel's sections on one grid — 16 / 8 margins, 88 + 8 + 88 + 8 + 24 columns, 24 pt rows, 4 pt between a row's buttons (#858); the toolbar on one 32 pt grid, without its Resources button (#1210); colour picker LCH and OKLCH models; an XML (Android Vector Drawable) export format; Context menus: the Menu key reaches egui 0.37 but is unbound (row done → partial); the Text on a path tool; board tool keys pinned; community fixes: the text box by dragging, the font picker keys, the pen path on leaving Design, a still canvas in vector edit mode, a scrolling pages list, colour emoji, readable new text in frames, system theme on first run; the Small caps sample in Type settings drawn from capitals; recent files as cards; vector edit mode: hovering, hatching, selecting and dragging filled regions; home screen: Templates tab, first-run templates and Getting started tips; number fields: scrub rates, arrow steps, arithmetic with brackets, relative edits of mixed values; outline mode's hidden layers and object bounds; Hide when publishing; cursors per tool and modifier; panel widths; dark pages for files made in the dark theme; drag threshold and double-clicks into text in groups; rotation origin on Alt+R and placing with Enter: no documented shortcut missing; keyboard shortcut parity suite and bindings; cursor chat and spotlight in live sessions; layers and assets panels behaviour suite and fixes; vector multi-edit and the vector edit tail; canvas navigation, guides and grids behaviour suite and fixes; shapes and vector behaviour suite and fixes; paint and effects behaviour suite and fixes; frames, groups, sections and masks behaviour suite and fixes; layers panel keyboard: F2 rename, Shift+F10 context menu, F8 box selection; selection and transform behaviour suite and fixes; Display P3: gamut warning and soft-proof (true P3 blocked upstream); several windows; boolean hit testing on the result, group drags, frame outlines and slices; outlines for the selection, mask outlines; arc fields, live boolean editing, shape builder on strokes, one-sided widths; fields select their text on focus; Typography spacing icons support scrubbing (#373); CSS colour names in hex fields; a rename selects the whole name, so typing replaces it; Escape or Enter after a pen path stays on the same vector (#760); IME composition kept on through idle frames of a text edit, candidates at the caret (#747); Selection colors for mixed selections and smart-selection spacing (#753); submenus with a hover delay and a safe triangle; the Actions palette's tabs, ranked search, highlight and recents; menu items that ask for a value; editor fixes from the community batches) · **Target:** Figma Design UI3 (desktop app 126.10.7)
+> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-02 · **Change:** patch (Backspace or Delete at the start of a list item keeps the item's indentation level, as the lists article says; max lines on auto-width text keep it auto width, hugging that many lines, as the text properties article says; superscript and subscript are synthesised where the font has no glyphs for them, from the standard glyphs shrunk and shifted by the font's OS/2 metrics, and a run mixing available and unavailable glyphs is synthesised whole, as Explore text properties says (#1828); the interface size keys of the help center's accessibility page: Cmd/Ctrl+Shift+Alt with =, - and 0 step the interface through the Preferences sizes and back to the system's size; Cmd/Ctrl+Alt+arrows rotate the selection a degree at a time, 15 with Shift, as the help center's accessibility page says; they resized before; the Layers panel answers Ctrl+1 as well as Alt+1 on Windows and Linux, the two keys the help center gives it; the colour picker's Image tab shows a placeholder and Upload from computer, an asset preview, and a file dropped on it replaces the image, keeping the fill mode, crop and position (#1682); the keyboard's Menu key opens the context menu, as Shift+F10 does; the eyedropper with Cmd/Ctrl+Shift makes a colour style or variable of what it picks; sidebar number and text fields keep their text vertically centered when focused, including typography spacing; with the pen out, Enter or a double-click ends the path and edits the vector with the Move tool instead of drawing on (#1430); the Actions palette offers only commands that run from it, and no second row reading like a menu item: Place image opens the file dialog (#1574); Preferences ▸ Scroll wheel zoom: a mouse wheel zooms the canvas about the pointer and Cmd/Ctrl+wheel scrolls (#1390); boolean operations refuse input past their caps, and a boolean group past them draws without its result (#1104); the selection and hover outlines of rounded rectangles and frames follow their corners (#1506); colour picker review fixes for text undo, fitted sidebars, moving controls and gradient variables; Corner smoothing: an original icon and the shared number-field drag gesture, preserving fractional baselines; guides snap to layers when dragged; Crop image: Object ▸ Crop image, the right-click menu and the image fill row enter crop mode (`image.crop`, #1464); the Design panel's sections on one grid — 16 / 8 margins, 88 + 8 + 88 + 8 + 24 columns, 24 pt rows, 4 pt between a row's buttons (#858); the toolbar on one 32 pt grid, without its Resources button (#1210); colour picker LCH and OKLCH models; an XML (Android Vector Drawable) export format; Context menus: the Menu key reaches egui 0.37 but is unbound (row done → partial); the Text on a path tool; board tool keys pinned; community fixes: the text box by dragging, the font picker keys, the pen path on leaving Design, a still canvas in vector edit mode, a scrolling pages list, colour emoji, readable new text in frames, system theme on first run; the Small caps sample in Type settings drawn from capitals; recent files as cards; vector edit mode: hovering, hatching, selecting and dragging filled regions; home screen: Templates tab, first-run templates and Getting started tips; number fields: scrub rates, arrow steps, arithmetic with brackets, relative edits of mixed values; outline mode's hidden layers and object bounds; Hide when publishing; cursors per tool and modifier; panel widths; dark pages for files made in the dark theme; drag threshold and double-clicks into text in groups; rotation origin on Alt+R and placing with Enter: no documented shortcut missing; keyboard shortcut parity suite and bindings; cursor chat and spotlight in live sessions; layers and assets panels behaviour suite and fixes; vector multi-edit and the vector edit tail; canvas navigation, guides and grids behaviour suite and fixes; shapes and vector behaviour suite and fixes; paint and effects behaviour suite and fixes; frames, groups, sections and masks behaviour suite and fixes; layers panel keyboard: F2 rename, Shift+F10 context menu, F8 box selection; selection and transform behaviour suite and fixes; Display P3: gamut warning and soft-proof (true P3 blocked upstream); several windows; boolean hit testing on the result, group drags, frame outlines and slices; outlines for the selection, mask outlines; arc fields, live boolean editing, shape builder on strokes, one-sided widths; fields select their text on focus; Typography spacing icons support scrubbing (#373); CSS colour names in hex fields; a rename selects the whole name, so typing replaces it; Escape or Enter after a pen path stays on the same vector (#760); IME composition kept on through idle frames of a text edit, candidates at the caret (#747); Selection colors for mixed selections and smart-selection spacing (#753); submenus with a hover delay and a safe triangle; the Actions palette's tabs, rLine truncated
 
 Fine canvas control is what Figma users feel first: handles, snapping, nudging, modifier keys,
 drag behaviour, numeric precision. This checklist covers the tools, gestures and panels. Status:
@@ -90,6 +90,7 @@ interaction feel not yet compared.
 | Shape builder (Shift+M) on fills, strokes and open paths; variable width (Shift+W), one side with Alt | done | |
 | Boolean groups: clicked where the result is, double-click or Cmd/Ctrl-click into operands, live results while dragging or editing points, per-operand operations | done | a group past the path operations' caps (250 000 segments, 2 million possible crossings, 4 million segments swept over a fold) draws without its result, with a warning, and Flatten refuses it (#1104) |
 | Text: point, auto height, fixed; caret, words, lines, IME | done | Backspace or Delete at the start of a list item takes its marker and keeps its level, the paragraph starting where the item's text did ("delete the counter, but keep the same level of indentation", Create bulleted and numbered lists; `text_tail_tests::list_keys_at_list_items`, text crate `behaviour_tests`); max lines on auto-width text keep it auto width, hugging up to that many lines and growing with its longest line ("Text resizing is set to auto height or auto width", Explore text properties; `text_behaviour_tests::max_lines_on_auto_width_text_keeps_auto_width_and_hugs_that_many_lines`); the font picker previews a family on the canvas while hovered (no undo step; Escape restores, #653) and Up/Down step through it (#352); a selection highlight after a line break starts at that line's start and an empty last line shows its mark (#665); carets step over whole emoji and accented letters; colour emoji draw from their colour tables (#300); IME composition replayed in tests as macOS sends it, not yet checked on a Mac (#747); CJK words by script run (no dictionary); vertical trim in Type settings; no spell check |
+| Text: superscript and subscript | done | `sups` / `subs` use the font's own glyphs where it has the feature and every letter or digit of the run gets one; otherwise the standard glyphs are drawn shrunk and raised or lowered by the font's OS/2 superscript and subscript metrics (0.65 em at 0.35 em up or 0.14 em down without them), and a run mixing available and unavailable glyphs is synthesised whole, as Explore text properties says ("Figma draws a synthesized version by using the font's standard version of the character, shrinking it, and positioning it accordingly"; mixed glyphs "all update to the synthesized form for consistency"), #1828; tests `text::tests::superscript_native_or_synthesised_and_never_mixed`, `text_behaviour_tests::superscript_and_subscript_are_synthesised_without_glyphs_for_them` |
 | Eyedropper (I) | done | picks the colour seen under the pointer (opaque) into the selection's fill and the recent colours, one undo step (`fx_behaviour_tests`); with Cmd/Ctrl+Shift held it makes a colour style or variable of it instead, as the reference app's eyedropper does: a Create from color window asks which, its name (the next free "Color n") and a variable's collection (the file's first, or a new one made with it in the same undo step), and leaves the selection's fills alone (`eyedropper_create_tests`, `sampled_color_tests`) |
 | Comment (C), Shift+C to show/hide | done | local only |
 | Text on a path (Figma Draw) | done | the Text on a path tool in the Text flyout (`tool.textOnPath`) shows the I-beam over a shape's or vector's path, and a click there puts new text on the path, starting at the click, with the path's effects and its fill when one shows; the path layer is removed, and the path comes back if nothing is typed. Also from the Design panel or `text.onPath`; the path is edited by resizing only |
@@ -178,6 +179,7 @@ in the table. `crates/ui-egui/src/shortcut_keys_tests.rs` drives the keys a look
 |---|---|---|
 | 2026-11-02 | patch | M4: Backspace or Delete at the start of a list item takes its marker and keeps its level ("Use Backspace or Delete at the beginning of a list item to delete the counter, but keep the same level of indentation", Create bulleted and numbered lists): a plain paragraph may now carry a list level, and the text layout starts it where that level's item text starts (the gutters stay even when no list is left). Backspace used to drop the level too, and Delete at an item's start deleted the next character. Tab on such a paragraph types a tab, as outside a list. Tests: `text_tail_tests::list_keys_at_list_items`, text crate `behaviour_tests::a_plain_paragraph_at_a_list_level_starts_where_the_items_text_does` |
 | 2026-11-02 | patch | M4: max lines on an auto-width text keep it auto width: the box hugs up to that many lines and still grows with its longest line ("Max lines is available only if truncate text is enabled, and: Text resizing is set to auto height or auto width", Explore text properties). `text.maxLines` turned such a text into a fixed truncating box with a stale height, so later typing no longer widened it; fixed-size text still becomes a truncating box, auto-height text hugs as before. Test: `text_behaviour_tests::max_lines_on_auto_width_text_keeps_auto_width_and_hugs_that_many_lines` |
+| 2026-11-02 | patch | M4, #1828: superscript and subscript synthesised where the font has no `sups` / `subs` glyphs (the standard glyph shrunk and shifted by the OS/2 metrics, the usual 0.65 em and 0.35 / 0.14 em offsets without them), and a run mixing available and unavailable glyphs synthesised whole, as Explore text properties says. Tests: `text::tests::superscript_native_or_synthesised_and_never_mixed`, `text_behaviour_tests::superscript_and_subscript_are_synthesised_without_glyphs_for_them`. |
 | 2026-11-01 | patch | Shortcuts: Cmd/Ctrl+Shift+Alt+= and - make the interface larger and smaller through the sizes Preferences offers, and Cmd/Ctrl+Shift+Alt+0 puts it back to the system's size ("Adjust the scale of the Figma UI [...] Reset to Default: Control ⇧Shift Alt 0; Make Larger: Control ⇧Shift Alt =; Make Smaller: Control ⇧Shift Alt -", Accessibility at Figma); the size is kept at once, as one picked in Preferences is. `pref.uiScaleUp`, `pref.uiScaleDown`, `pref.uiScaleReset`; the sizes list now lives in the engine (`UI_SCALE_SIZES`) and Preferences reads it from there. Found by a documentation audit of the shortcuts. Test: `keymap_tests::the_interface_size_keys_step_through_the_preferences_sizes`. Documented rows 130 → 133, bound 129 → 132 |
 | 2026-11-01 | patch | Shortcuts: Cmd/Ctrl+Alt+↑/↓ (and ←/→) rotate the selection one degree at a time, 15 with Shift ("Press ⌘Command ⌥Option ↑/ ↓ on Mac or Control Alt ↑/↓ on Windows to rotate an object one degree at a time", Accessibility at Figma); they resized by the nudge before, which Cmd/Ctrl+arrows without Alt still do. Down and right turn clockwise, up and left back (the documentation is silent on the direction). In the shortcuts panel's Transform tab, over the control channel's `ui.key` too. Found by a documentation audit of the shortcuts. Test: `shortcut_keys_tests::cmd_alt_arrows_rotate_a_degree_and_fifteen_with_shift`. Documented rows 129 → 130, bound 128 → 129 |
 | 2026-11-01 | patch | Shortcuts: the Layers panel opens with Ctrl+1 as well as Alt+1 on Windows and Linux ("Mac: Option 1 Windows: Ctrl 1" in Select layers and objects; "Windows: Alt 1" in Explore the navigation bar and left sidebar). macOS keeps Option+1. Found by a documentation audit of the shortcuts (every chord driven over the control channel). Tests: `keymap_tests::the_layers_panel_answers_both_of_its_documented_windows_keys`, the parity row. Counts unchanged |