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The rich editor mutates its DOM through `Range` rather than the browser's
editing commands, because `execCommand('insertText')` is ~O(n²) on large
multiline blobs and froze the composer for seconds on a big paste (#45812).
Those mutations never reach Chromium's undo stack, so a paste was invisible to
it — Cmd+Z skipped straight past the pasted text and undid whatever edit came
before it, leaving the paste stranded and the earlier edit destroyed.
Owning the stack outright is the only coherent fix; a half-owned one interleaves
our snapshots with Chromium's own typing entries and undoes them out of order.
Every edit path now banks its pre-edit state, and the editor claims Cmd+Z /
Cmd+Shift+Z (plus Ctrl+Y) instead of letting the native command run. Snapshots
are plain text + a caret offset rather than DOM, since the editor already
round-trips losslessly through composerPlainText/renderComposerContents.
Consecutive keystrokes coalesce inside a 600ms window, so undo steps back by a
typing burst the way a native editor does rather than one character at a time.
Electron's Edit menu `{ role: 'undo' }` fires the native command without a
keystroke the renderer can see, so a capture-phase `beforeinput` listener claims
historyUndo/historyRedo too and keeps the menu item and the shortcut in
agreement. Switching drafts resets the history — undoing into another
conversation's text is worse than having none.
Co-authored-by: David Metcalfe <80915+DavidMetcalfe@users.noreply.github.com>
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