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bug#32825: 27.0.50; Deterministic window management

From: Juri Linkov
Subject: bug#32825: 27.0.50; Deterministic window management
Date: Mon, 05 Nov 2018 23:49:27 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>>> (1) Decide whether a specific window can be (re-)used.  Should we
>>> refute it when the window cannot be enlarged to 'min-height' lines?
>>> The decision would have to be made via 'window-resizable-p' and its
>>> IGNORE argument set to the window itself so we can, for example,
>>> (re-)use a preserved size window showing some other buffer.
>>> (2) Actually resize that window via a 'window-height' entry.  This is
>>> independent from (1).  Processing a 'window-height' entry is just some
>>> sort of bonus work 'display-buffer' does for the convenience of the
>>> user.  It in now way affects the decision which window is chosen.
>>> So please think of any bad consequences of what we decide in (1) like
>>> not using _any_ window on the selected frame because none of them fits
>>> the 'min-height' constraint.  Consider a default two windows frame
>>> where the size of the selected window is preserved.
>> Maybe simply display the buffer in the below window regardless of its
>> size?  Because it makes no sense for display-buffer-below-selected to
>> display the buffer in a window other than below.
> But then the same argument holds for popping up a new window.  Even
> if we can't make the new window as large as we want, popping it up
> below the selected one is the only thing that makes sense if the
> selected window is at the bottom of the frame.  Unless we decide that
> failing should be better than not making the window high enough.

Maybe I misunderstand something, but I see that already everything is
working fine.  When I tried with display-buffer-below-selected
to cause an error in a narrow buffer at the bottom of the frame,
then the *Backtrace* buffer is displayed in a new window created
by horizontal splitting of the largest window on the frame.

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