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bug#6204: vc-dir always splits the frame

From: Stefan Monnier
Subject: bug#6204: vc-dir always splits the frame
Date: Thu, 27 May 2010 00:04:30 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

>> No, the application's choice should prevail because it's more specific.
> I thought the idea was that an application can override a user's
> customizations iff it explicitly states that.

Yes and the users can still do that with special-display-regexps.
But pop-up-frames and pop-up-windows are really very vague global
preferences, whereas an application going through to trouble of
specifying default-params has decided that it usually deserves
special treatment.

> So should `pop-up-windows' be considered a "weaker" option than
> `special-display-regexps' wrt the argument of `display-buffer'?

Very much so, yes, since it's only a boolean value and applies to all
display-buffer calls, it's very non-discerning and carries very little
information about the user's preferences.

Some of the intention behind the `default-params' would be to get rid of
calls to switch-to-buffer (replaced by calls to pop-to-buffer with
a same-window default-param).  Such cases already disregard
pop-up-windows and pop-up-frames, so ignoring them w.r.t default-params
would be consistent with such a case.


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