- A press selects its cell when the button goes down and a drag extends from it; Shift/Ctrl act
on the press; checkboxes and links act on the click; the selection border, a selected column
header, objects and Page Layout headers/footers wait for the drag or click (#900).
- Double-clicking the fill handle fills down to the bottom of the data region around the source,
stopping above the first filled cell under it: new `edit.autoFillToData`, tested against 13
cases observed in Excel (#877). The old double-click handler was never reached.
- While typing a formula, column and row headings point `B:B`, `B:D`, `3:3` into it (#872);
whole-column and whole-row references are coloured and outlined (#873, #875); F4 toggles them
`$B:$D` / `B:D` as Excel does.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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