M4: Docs: the mirror formula's pipes no longer split the table row (#2110)

The |BA| and |BC| in the ui-parity row read as column separators; they are escaped now, so the row keeps its three cells.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Model-Effort: Opus 5.5 drove and wrote

docs/ui-parity.md

@@ -187,7 +187,7 @@ in the table. `crates/ui-egui/src/shortcut_keys_tests.rs` drives the keys a look
 
 | Date | Change | Summary |
 |---|---|---|
-| 2026-11-11 | patch | M4, #2110: in vector edit mode, choosing Mirror angle or Mirror angle and length for a sharp point (two segments, no handles) makes it smooth, as measured in Figma: both handles on one line through the point, along `(B - A) / |BA|^2 + (C - B) / |BC|^2` (A and C the far ends of its segments), each 0.3905 x its own segment for angle, both 0.3905 x the shorter segment for angle and length (the factor is known to about three digits; the length rule is medium confidence); several selected points each become smooth. Open-path ends, points that already have a handle, and points with a coincident neighbour keep the old behaviour. Evidence: tests in `crates/engine/src/canvas/vectoredit/ops.rs` and `tests.rs` |
+| 2026-11-11 | patch | M4, #2110: in vector edit mode, choosing Mirror angle or Mirror angle and length for a sharp point (two segments, no handles) makes it smooth, as measured in Figma: both handles on one line through the point, along `(B - A) / \|BA\|^2 + (C - B) / \|BC\|^2` (A and C the far ends of its segments), each 0.3905 x its own segment for angle, both 0.3905 x the shorter segment for angle and length (the factor is known to about three digits; the length rule is medium confidence); several selected points each become smooth. Open-path ends, points that already have a handle, and points with a coincident neighbour keep the old behaviour. Evidence: tests in `crates/engine/src/canvas/vectoredit/ops.rs` and `tests.rs` |
 | 2026-11-02 | patch | Shortcuts: a Cmd/Ctrl-click on a padding field (the horizontal or vertical pair, or a side with Individual padding open) makes the value typed go to all four sides, in one undo step (Guide to auto layout, Keyboard shortcut guide); a plain click still edits that axis or side alone. A documented gesture row: 134 documented, 133 bound. Test: `padding_individual_tests` |
 | 2026-11-01 | patch | Number fields: dragging the field itself with Alt held scrubs it ("You can also hover the input field itself and hold down the modifier key: Mac: ⌥ Option Windows: Alt", Adjust alignment, rotation, position, and dimensions), with the resize cursor and the label's rates (Alt is the enabler there, so it isn't the fine rate); a click with Alt doesn't open the editor. Found by a documentation audit of the ui-parity rows. Test: `field_tests::alt_held_over_a_field_scrubs_it`. Counts unchanged |
 | 2026-11-02 | patch | M6, #1839: with a shape or frame tool chosen and nothing selected, the arrows show a placement crosshair in the middle of the view and move it by the nudge amounts (`tool.crosshair`), Enter places the object there (`tool.place`), Escape or a tool change takes it away; the canvas draws the crosshair and `ui.inspect` reports it (`tool.crosshair`), the Keyboard shortcuts panel lists the gesture ("Use the arrow keys to activate the crosshair cursor...", Accessibility at Figma). The board Shapes tool places on it too (its 160 px shape centred, as the tool centres a press), and the view pans by the overshoot when the crosshair is nudged past its edge. Tests: `place_crosshair_tests`, `shortcut_keys_tests::arrows_show_and_move_the_placement_crosshair_with_a_shape_tool`. |