Files
wordcraft/crates/engine/src
a9eb233a9d Track changes: keep other authors' deletions, credit paragraph splits, exact edit snapshots (split from #54) (#125)
* Track changes: a tracked delete keeps other authors' deletions

Deleting a range with Track Changes on marked every run in it as deleted
by the current author, also text another author had already deleted.
That author's deletion was lost: the change list showed it under the
wrong name, and rejecting the second author's changes brought back text
the first author had deleted. Text that is already deleted now keeps its
deletion and its author, like Word.

* Track changes: a tracked paragraph split credits the new mark to its author

Pressing Enter with Track Changes on inserts a paragraph mark by the
current author, but the paragraph after the split took its mark's
revisions from the text at the caret. Inside or at the end of another
author's insertion, the original paragraph mark then showed as inserted
by that author. The paragraph after the split now keeps the original
mark's revisions; only the new mark is the splitting author's.

* Engine: edit snapshots that take commands back exactly

Session::edit_snapshot and Session::restore let a caller run a command
and take it back without a trace: the document, the selection, the undo
and redo stacks, the open typing group, a pending join_next_undo and
the dirty flag come back as they were, and the layout is recomputed.
Edit > Undo cannot do this: it leaves a redo step, loses the redo stack
the command cleared, and closes the typing group.

At the undo limit (500 steps) a command pushes the oldest step out. The
snapshot keeps the oldest steps when the stack is near the limit and
restore puts them back, so the stack is exact there too (up to four
commands between snapshot and restore).

Restore is exact for commands that add undo steps; edit.undo and
file.new/file.open in between are outside its contract (documented).
The snapshot destructures every Session field, so a new field does not
build until someone decides whether a snapshot must cover it.

Session::undo_depth and the snapshot's doc/dirty/undo_depth accessors
tell a caller whether the command changed anything.

* Tests: hostile_params_never_panic leaves out review.readAloud

Read Aloud hands the document's text to the system's speech synthesizer
(say, PowerShell, spd-say or espeak), so running the test made the
computer speak the sample document. Like the file commands, it is left
out of the sweep.

* Undo: evictions at the limit are counted everywhere edit snapshots rely on them

Merging main brought two paths #125's eviction counter didn't know: push_undo (typing parity, #204) dropped the oldest step without counting it, and a failed command (#153) put the whole stacks back but left the count raised. Either made restore() bring back a step that had never left. Both now keep the count right; restore_is_exact_at_the_undo_limit covers each (both fail without the fix).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: lpgn <2556951+lpgn@users.noreply.github.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-10 09:07:32 -04:00
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