Reference point: the locator is one Tab stop, and the arrow keys move the point

Each of the locator's nine squares was a Tab stop of its own, so Tab from
the field before it in the Transform panel, the Properties panel, the
Control bar and the dialogs that show it stopped up to nine times before
it reached the next field. The locator is now one Tab stop. While it has
the focus it shows an outline, and the arrow keys move the reference
point one square, stopping at the edges. A click on a square works as
before.

Screen readers get a radio group holding the nine squares as radio
buttons, with the current point as its value. The group is named after
the label next to the locator: Reference Point, or Pivot, Alignment,
Registration or Placement where the locator sets one of those.

docs/target-app-parity.md

@@ -750,7 +750,7 @@ Moved from the ROADMAP's "Shipped so far" on 2026-10-10. Update it when a featur
   - The Pattern Options panel's Name field and the name fields that a double-click opens in the Layers, Artboards and Asset Export panels take Shift+Enter (Shift+Return) the same way: it applies the name and keeps the field active with the name selected.
   - Scrubby labels (#400, beyond Illustrator, as in Photoshop): dragging a numeric field's label left or right (the ↔ cursor shows over it) steps the value one unit every 2 points (Shift: ten, Ctrl/Cmd: a tenth; counts stay whole), in the field's unit and within its limits, applied live as the art follows; the whole drag is one undo step and Escape puts the value back. A click on the label focuses the field; the text box itself never scrubs, and a field with no label doesn't. Text labels before a field (Transform, Properties, Control bar, Stroke, Transparency, form rows in dialogs) and the Character and Paragraph panels' icons act as labels, and so do the links that label a field (the Control bar's Stroke: and Opacity:, the Properties panel's Stroke), which a click still follows to their panel (#4088). Preferences › General › Scrub Numeric Fields by Dragging (on by default) turns it off.
   - In the Transform panel, the Properties panel's Transform section and the Control bar, Alt+Enter (Option+Return) applies a value to a copy of the selection and selects the copy, in one undo step. With anchor points selected with Direct Selection it applies the value to them, as Enter does. Ctrl/Cmd+Enter in W or H applies the value and scales the selection proportionally with the link off. With the Artboard tool, it scales the active artboard proportionally. A percentage typed alone in W or H (`50%`) is that share of the size the field shows, and the link and Ctrl/Cmd+Enter keep the proportions as with a length (#2401).
-  - The Control bar's underlined Transform link opens the Transform panel in a popover under it (reference point, X/Y/W/H, Rotate and Shear with their icons and angle presets, flips, shape properties, Scale Corners and Scale Strokes & Effects), as its Stroke link does the Stroke panel; X/Y/W/H also show inline while the bar has room. The reference point locator is nine squares, the outer eight joined around the box.
+  - The Control bar's underlined Transform link opens the Transform panel in a popover under it (reference point, X/Y/W/H, Rotate and Shear with their icons and angle presets, flips, shape properties, Scale Corners and Scale Strokes & Effects), as its Stroke link does the Stroke panel; X/Y/W/H also show inline while the bar has room. The reference point locator is nine squares, the outer eight joined around the box. As VectorCraft's own keyboard rule, the locator is one tab stop in the Control bar popover, the Transform panel, the Properties panel and the dialogs, the Arrange Tools dialogs included. While it has the focus it shows an outline, and ←, →, ↑ and ↓ move the reference point one square, stopping at the edges (`the_reference_point_grid_is_one_tab_stop`, `arrow_keys_move_the_reference_point`, `the_reference_point_locator_is_one_tab_stop_and_arrows_move_it`).
   - In isolation mode the Control bar has an Exit Isolation Mode button (`object.exitIsolation`), except while a pattern is edited. Outside isolation mode, with one group, compound path, path, image, mesh or placed file selected, it has an Isolate Selected Object button (`object.isolate`), which also isolates a path inside a group that Direct Selection selected.
   - While an opacity mask is edited, Exit Isolation Mode (Esc, the isolation bar's back arrow, the Control bar's button, and the Layers panel menu's and canvas context menu's Exit Isolation Mode) leaves mask editing as Stop Editing Opacity Mask does, in one undo step: the mask keeps the edits, and the masked object is selected. While a pattern is edited, the Exit Isolation Mode item of the Layers panel menu and of the canvas context menu saves the pattern and leaves pattern editing, as Done does.
   - Tab shows and hides the panels (in the Type tool it types a tab) without moving the keyboard focus onto a field, so the next shortcut or letter still works; in dialogs and panel fields it moves between fields, one press each — a numeric field's scrub label is not a tab stop of its own, and the Transform panel's, Properties panel's and Control bar's W/H link comes after the fields it sits between (`one_tab_moves_from_a_field_to_the_next`). A field's up/down spinner, the chevron that opens its presets (Stroke Weight, font size, Rotate, Export for Screens' scale) and the Transparency row's opacity slider chevron are not tab stops either. Alt+↓ with no other modifier in a field with presets opens them with the keyboard focus on the chosen one, instead of stepping the field down; Enter picks the focused preset without pressing a dialog's OK, and after a pick or Escape the field has the keyboard focus again (`tab_goes_from_field_to_field_past_the_spinner_and_the_preset_chevron`, `tab_goes_from_the_opacity_field_past_its_slider_chevron`, `alt_down_opens_a_fields_presets_for_the_keyboard`, `escape_closes_a_fields_presets_and_returns_to_the_field`).