commit https://github.com/vim/vim/commit/11fbc2866ccc11b4dd1726abdaf582a78ef3f743 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 2 21:48:32 2016 +0200 patch 7.4.2309 Problem: Crash when doing tabnext in a BufUnload autocmd. (Dominique Pelle) Solution: When detecting that the tab page changed, don't just abort but delete the window where w_buffer is NULL.

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	Test fdm=indent START
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Test fdm=indent and :move bug END
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