GTK undo stack corruption under unknown conditions

Hi, I frequently experience undo stack corruption in gnome-text-editor. This is quite frustrating, but I don’t know how to reproduce it. If anyone is able to figure out how to reproduce the bug, that would be tremendously helpful.

One option might be to start by creating some serialization for the undo stack so that upon failure you can gdb in and dump it. In applications like Builder I’d just create a GAction for it, but putting that in GTK upstream is probably less desirable.
We have a lot of tests for the undo stack, so trying to come up with interesting combinations there to break it might also be another way to make progress.

A big hammer, but yeah, that would probably allow us to track this down…

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