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9813c00dd3
Problem: can't accurately know if close_buffer directly (e.g: not via autocmds) decremented b_nwindows. This can cause crashes if win_close_othertab decides to keep the window after calling close_buffer (if it did not free the buffer), as b_nwindows may remain out-of-sync. Solution: change the return value of close_buffer to accurately depict whether it decremented b_nwindows. Check it in win_close_othertab to avoid a crash. Similar issues may exist in other places that call close_buffer, but I've not addressed those here (not to mention only one other place even checks its return value...)