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Docs: the panic guard's note says what happens to a group the command ended

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It keeps a step from the group's start to the restored workbook, so Undo
still returns to the state before the group; the note said the history came
back exactly.
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prxnvt
2026-10-24 01:41:03 -04:00
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@@ -34,7 +34,9 @@ including tests, 2026-10-10.
enabled, run, journal, undoable }`; ids follow Excel's ribbon (`home.bold`, `insert.chart`, enabled, run, journal, undoable }`; ids follow Excel's ribbon (`home.bold`, `insert.chart`,
`data.sortAscending`) plus primitives (`cell.set`, `selection.set`, `range.setValues`). `data.sortAscending`) plus primitives (`cell.set`, `selection.set`, `range.setValues`).
`Session::execute` catches escaped panics and restores the workbook, its selection and its `Session::execute` catches escaped panics and restores the workbook, its selection and its
undo and redo history as they were before the command (never-crash guard). undo and redo history as they were before the command (never-crash guard); a group that was
open before the command and that the command ended or rolled back stays ended and keeps a
step from its start to the restored workbook, so Undo still returns to the state before it.
2. **Edits** change the model through copy-on-write bands; undo keeps the previous snapshot. 2. **Edits** change the model through copy-on-write bands; undo keeps the previous snapshot.
Undo retains at most 100 steps and trims older steps when its estimated retained cell storage Undo retains at most 100 steps and trims older steps when its estimated retained cell storage
exceeds 128 MiB. The newest step remains undoable even if that step alone exceeds the budget. exceeds 128 MiB. The newest step remains undoable even if that step alone exceeds the budget.