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bug#6933: 24.0.50; fringe-mode value of `half' is broken
From: |
Eli Zaretskii |
Subject: |
bug#6933: 24.0.50; fringe-mode value of `half' is broken |
Date: |
Sat, 28 Aug 2010 11:45:36 +0300 |
> From: "Drew Adams" <drew.adams@oracle.com>
> Date: Fri, 27 Aug 2010 17:16:26 -0700
>
> emacs -Q
>
> M-x fringe-mode
> Enter `half'.
>
> The fringe values (both left and right) should each be 5, according to
> the code and comments. Instead, it is still 8, as shown by
> (frame-parameters). There is no difference in behavior between `half'
> and `default'. Dunno whether this is Windows-specific.
This happens because fringe.el has this customization form for "half"
in the defcustom for fringe-mode:
(const :tag "Half width" (5 . 5))
And the doc string for fringe-mode says this, among the rest:
This command may round up the left and
right width specifications to ensure that their sum is a multiple
of the character width of a frame.
So 5 is rounded up to 8, and the rest is history.
I don't know why the values are 5 instead of 4. The default fringe
width is 8 on all GUI displays, so half of that should have been 4,
not 5. Maybe I'm missing some subtlety here.
Can someone please check on X whether (fringe-mode '(4 . 4)) does TRT?
If it does, I think we should use 4 instead of 5 in the above
defcustom.