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bug#9419: 24.0.50; C-x k deletes the entire frame instead of switching t

From: Stefan Monnier
Subject: bug#9419: 24.0.50; C-x k deletes the entire frame instead of switching to another buffer
Date: Tue, 06 Sep 2011 09:17:04 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>> > On second though, if we are trying to fix the specific use case of
>> > save-window-excursion, why not solve it on the level of
>> > save-window-excursion?

I think we first need to decide what use case we want to fix:
- the use of save-window-excursion is normally for "I want to run this
  code which fiddles with the windows, but I don't want it to fiddle
  with the windows".  I.e. unless the code really only fiddles with
  windows and never with frames it is actually a bug since you can't
  fully undo frame operations (they're visible to the user before we
  get to try and undo them).
- the use of "get current-window-configuration, store it in a global var,
  give the hand back to the user, at some later time, call
  set-window-configuration".  This is not a good solution since it
  assumes that the user works in a strict nesting way, whereas in
  practice (and with frames even more so), the user may interleave two
  or more activities, so the set-window-configuration may end up
  deleting/resetting windows in undesired ways.

So the problem is really not in how those primitives are implemented,
but in the functionality offered by those primitives.


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