[Geany] what exactly is Alt-Backspace doing?

[John Gabriele]

What command does Alt-Backspace do? It seems to undo largish swaths of
things, but interferes with the real undo, leaving it's handiwork
un-undoable. Actually, it's not obvious what it's exactly doing. I hit
Alt-Backspace occasionally by accident because it's the Emacs and Bash
shell command for "backspace over previous word".

It would be nice if it did nothing when I accidentally hit it (like
how Alt-Delete does nothing).

---John