Table cell focus and keyboard navigation

Rendered GFM tables use EditableTable in src/markdown/widgets.rs. This note covers keyboard focus during in-cell editing (Tab / Shift+Tab) and hit-testing for empty display-mode cells.

For general table behavior (deferred commits, toolbar, markdown sync), see editable-tables.md. For session-triggered commit when leaving a table for another block type, see rendered-edit-session-tables.md.

Empty cells — display hit area (issue #131)

While a cell is not focused, it draws in display mode using a formatted galley. Empty text yields a galley with no extent; an interactive Label had zero click size, so users could not click into new empty slots. The widget now allocates the padded inner rectangle with allocate_exact_size(.., Sense::click()) and paints the galley at that rect’s origin so the visible cell accepts clicks like populated cells.

Tab keeps focus inside the table

Plain TextEdit (default lock_focus) treats Tab as move to the next widget in egui’s global tab order, so focus left the grid before internal pending_focus navigation could behave like Enter.

Table cells use TextEdit::lock_focus(true) so Tab is reserved for grid navigation. Tab / Shift+Tab are consume_key’d before TextEdit::show so \t and TextEdit indentation helpers do not mutate cell text.

Shift+Tab must be consumed before plain Tab

InputState::consume_key uses Modifiers::matches_logically. A pattern of Modifiers::NONE matches Shift+Tab (extra Shift is allowed). Always call consume_key(SHIFT, Tab) before consume_key(NONE, Tab), then handle move_prev before move_next in the same frame.

Manual regression

Manual cases TBLE-1 … TBLE-3 live in v0.3.0-regression-matrix.md §3.11. Rendered-session cross-block cases RS-1 … RS-7 (including RS-5 table → heading) are in §3.12 — see rendered-edit-session.md.