Summary #
Undo/redo (u / Ctrl-R or maybe better ergonomic default bindings? Not a big fan of Vim's Ctrl-R at all). Does not exist yet anywhere.
Requirement #
Must be multi-aware: edits batch across cursors (insert-all/backspace-all/delete-all), and multibuffer edits route into source buffers via with-buffer + remap-excerpts. Undo must replay across all affected cursors and buffers coherently, and excerpt range remaps must be reversible.
Proposed approach #
History of edit ops (buffer id + range + replacement) grouped per user action; redo as the inverse. Integrate with the multibuffer edit path.
Scope / notes #
Foundational; coordinate with per-cursor selections. I would love to make some sort of graphical undotree and make it persistent instead of live solely in-memory