[dylans]

#6282 extended whole-block removal for a hanging selection to nested sibling blocks. Editors that don't mark table cells with editor.isIsolated (every editor written before 0.136) can now lose whole cells when dragging or cutting across them; the table example's Firefox drag test fails on main. The richtext undo-scroll test also fails on main: after undoing a triple-click deletion, the default scroll targets the start of the following block, so the restored paragraph stays off screen.

• Editor.deleteFragment removes whole blocks only for top-level blocks. Nested blocks keep the pre-0.138 behavior.
• Triple-click keeps the native selection only for top-level, non-isolated blocks. Nested blocks select their own contents, as before 0.138.
• Cut and drag go back to the top-level whole-block handling from Move whole lines as blocks when dragging or cutting #6171.
• defaultScrollSelectionIntoView scrolls to the unhung end of a forward hanging selection.

Verified locally with retries off: richtext, tables, delete-line, triple-click and scroll-selection suites across Chromium, Firefox, mobile Chromium and WebKit, 129 passed and 19 platform skips. Both failures from CI on main pass. Updated core tests cover nested blocks.

Follow-up to #6282

[changeset-bot]

🦋 Changeset detected

Latest commit: 78fd5ab

The changes in this PR will be included in the next version bump.

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slate	Patch
slate-react	Patch

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