GNU bug report logs - #32672
27.0.50; image resize on window resizing

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From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>
Cc: 32672 <at> debbugs.gnu.org
Subject: bug#32672: 27.0.50; image resize on window resizing
Date: Wed, 19 Sep 2018 10:22:59 +0200

[Message part 1 (text/plain, inline)]

> Please try with more buffers than initial 2 (*scratch* and *Messages*),
> e.g. with *info* (just `C-h i'), I get
>
> 1 ... current: *scratch* ... window-buffer: *scratch*

... which is something you probably don't even want - it comes from
'get-buffer-create' when making the *info* buffer ...

> 2 ... current: *scratch* ... window-buffer: *info*
>
> which is in an inconsistent state,

... not really - look at the backtrace:

  foo()
  run-hooks(buffer-list-update-hook)
  record-window-buffer(#<window 3 on *info*>)
  set-window-buffer(#<window 3 on *info*> #<buffer *info*>)
  window--display-buffer(#<buffer *info*> #<window 3 on *info*> reuse ((inhibit-same-window)))
  display-buffer-same-window(#<buffer *info*> ((inhibit-same-window)))
  display-buffer(#<buffer *info*> (display-buffer-same-window (inhibit-same-window)))
  pop-to-buffer("*info*" (display-buffer-same-window (inhibit-same-window)) nil)
  pop-to-buffer-same-window("*info*")
  info(nil nil)
  funcall-interactively(info nil nil)
  call-interactively(info nil nil)
  command-execute(info)

'pop-to-buffer' can "reasonably" select the window and thus implicitly
make its buffer current only _after_ the buffer has been displayed via
'display-buffer-same-window'.  I say reasonably because we could make
the buffer current earlier but this doesn't strike me as a very good
idea.  It would constitute an incompatible change in the internal
behavior of 'pop-to-buffer'.

> and after typing `q' the hook is called 3 times
>
> 3 ... current: *scratch* ... window-buffer: *scratch*
> 4 ... current: *scratch* ... window-buffer: *scratch*
> 5 ... current: *scratch* ... window-buffer: *scratch*

Look at the backtraces:

3 ... current: *scratch* ... window-buffer: *scratch*
  run-hooks(buffer-list-update-hook)
  record-window-buffer(#<window 3 on *scratch*>)
  set-window-buffer(#<window 3 on *scratch*> #<buffer *scratch*>)
  set-window-buffer-start-and-point(#<window 3 on *scratch*> #<buffer *scratch*> 1 #<marker at 1598 in *scratch*>)
  quit-restore-window(nil bury)
  quit-window()
  Info-exit()
  funcall-interactively(Info-exit)
  call-interactively(Info-exit nil nil)
  command-execute(Info-exit)

This one comes from replacing the *info* buffer with *scratch* in the
window.

4 ... current: *scratch* ... window-buffer: *scratch*
  run-hooks(buffer-list-update-hook)
  select-window(#<window 3 on *scratch*>)
  quit-restore-window(nil bury)
  quit-window()
  Info-exit()
  funcall-interactively(Info-exit)
  call-interactively(Info-exit nil nil)
  command-execute(Info-exit)

This one comes from selecting that window.

5 ... current: *scratch* ... window-buffer: *scratch*
  run-hooks(buffer-list-update-hook)
  bury-buffer-internal(#<buffer *info*>)
  quit-restore-window(nil bury)
  quit-window()
  Info-exit()
  funcall-interactively(Info-exit)
  call-interactively(Info-exit nil nil)
  command-execute(Info-exit)

And this one comes from burying the *info* buffer.  What should we do
instead?

> And there is the workflow how to break the correct order
> of `C-x <right> C-x <left>':
>
> 1. Create *info* buffer: `C-h i' and quit `q'
> 2. Split windows `C-x 2' or `C-x 3' (both windows display *scratch*)
> 3. Check that `C-x <right> C-x <left>' correctly returns to the original
>     buffer *scratch* in the first window.
> 4. After `C-x o' in another window `C-x <right> C-x <left>'
>     doesn't return to the original buffer *scratch*.
>     It displays *info*.

Evidently, this comment for 'record-window-buffer'

;; The following function is called by `set-window-buffer' _before_ it
;; replaces the buffer of the argument window with the new buffer.

had its purpose.  Please try the attached patch.

Thanks, martin

[buffer-list-update-hook.diff (text/plain, attachment)]

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