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RiceDee
bfc6f8b1b9
The tabs share one text box, and its Undo history was cleared whenever
another document's box took it: opening a paragraph in tab B wiped tab
A's typing steps, so Edit ▸ Undo back in A found none and closed A's
paragraph instead of taking the typing back. The box being left now
keeps a copy of its history and caret aside, under its document, and
the same box gets it back on its return; a box new to the text box
still starts with none, so typing still never reaches another tab. The
copy is a deep one: a state's history is shared between its clones.
Carried from #4179 (abc378c0). On this branch the rows' alignments by
text go aside and come back with the history, so Undo after the trip
still restores a deleted row's alignment.