bug#19576: write-file writes the wrong buffer

[Eli Zaretskii]

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> Date: Thu, 19 Nov 2015 09:13:11 +0100
> From: martin rudalics <rudalics@gmx.at>
> CC: juri@linkov.net, andlind@gmail.com, 19576@debbugs.gnu.org
> 
>  > Martin, is there any reason why window_resize_apply doesn't set the
>  > frame's window_sizes_changed flag, but instead relies on its callers
>  > to do that?
> 
> No particular reason.  But note that ‘delete-other-windows-internal’ may
> bypass window_resize_apply, so in that particular case we have to
> manually make sure that the window_sizes_changed flag gets set.  I hope
> this is the only case where it matters.

Would you mind doing this on the master branch, please?