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bcb70eeac4
Problem: win_enter autocommands can close new_curwin, crashing if it was the last window in its tabpage after removing win, or can close parent, crashing when attempting to split it later. Solution: remove win first, check that parent is valid after win_enter. NOTE: This isn't actually quite right, as this means win is not in the window list or even has a frame when triggering enter autocommands (so it's not considered valid in the tabpage). This is addressed in later commits.