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split-window-{right, below} not interchangeable with split-window-sensib

From: Tassilo Horn
Subject: split-window-{right, below} not interchangeable with split-window-sensibly
Date: Wed, 18 Jul 2012 08:52:23 +0200
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.1.50 (gnu/linux)


I really like sensible window splitting, and basically I want to use it
almost everywhere.  (That's what split-window-preferred-function is for
which works just fine.)

However, there are modes like ediff that have their own
foo-split-window-fn defcustom.  There you can use both
split-window-{right,below}, but split-window-sensibly doesn't
necessarily work, because the former functions have an optional SIZE arg
while the latter has a mandatory WINDOW arg.

For example, ediff just does

    (funcall ediff-split-window-function)

and that clearly errors if its set to split-window-sensibly.
Internally, ediff somehow ignores the error and you end up with only one

Wouldn't it make sense to have the same signatures for
split-window-sensibly and the other two functions so that they were

Well, the SIZE arg is not too meaningful for split-window-sensibly as it
would mean either SIZE cols or lines...  So maybe just making its WINDOW
arg optional would suffice for almost all use-cases.


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