Activate the one undo stack behind the Undo button and Ctrl+Y (BL-6681, Stage 1) - #8317

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JohnThomson wants to merge 10 commits into

BL-6681-ckeditorfrom

BL-6681-stage1-undostack

Commits on Sep 7, 2026

Correct two wrong claims about Undo, and record Stage 1's deferred edits (BL-6681)

JohnThomson
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claude
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4ef2532
Add the one undo stack, inert (BL-6681)

JohnThomson
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claude
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1f93ab9
Activate the one undo stack: the Undo button and Ctrl+Y go through it (BL-6681)
JohnThomson
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f923830
Record the 2026-09-07 sync, Stage 1 verification and BL-13502 assessment (BL-6681)
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ac09a58
Reproduce the edit-handler accumulation and record the G2 attempt (BL-6681)
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4a413d0
Capture the paste/drop baseline, and the paste-filter bypass it exposed (BL-6681)
JohnThomson
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0073466
Record the integration-branch nightly result (BL-6681)
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495cee7
Route the Undo button to the workspace frame's stack, and fix what review found (BL-6681)

JohnThomson
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claude
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8e70aa5
Survive a page change during an in-flight undo or an open undoable scope (BL-6681)

JohnThomson
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claude
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448e5d0
Never record an entry for a page that is no longer current (BL-6681)

JohnThomson
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claude
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ecff075