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7e2e3f8c25
Problem: Undo places the cursor wherever the cursor happened to sit at "save time" (`uh_cursor` is sampled lazily on the first change). Examples: - `i` preserves, but `a` does not - `diw`, `atest<Esc>`, `d^` abandon the original position - `D`, `o` restore it (by accident). Solution: `composite` tracks the pending atom (and its `origin`) across frames. A `stuffed` continuation frame inherits the `origin` + prepped redo. Store `origin` info in the undo header, so undo can restore it. - Not for a mid-command undo break (i_CTRL-G_u). - Undoing a mapping restores where the mapping started (which technically may be different than where the "edit" started).