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bug#20628: 25.0.50; Incorrect line height for some fonts

From: Oleh Krehel
Subject: bug#20628: 25.0.50; Incorrect line height for some fonts
Date: Fri, 22 May 2015 15:54:21 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux)

Eli Zaretskii <address@hidden> writes:

>> From: Oleh Krehel <address@hidden>
>> Cc: address@hidden,  address@hidden
>> Date: Fri, 22 May 2015 15:15:45 +0200
>> Eli Zaretskii <address@hidden> writes:
>> > Btw, in the version of DejaVu Sans Mono I just downloaded from their
>> > site doesn't cover the U+01D779 character.
>> It appears to re-use the system fixed width font (Ubuntu Mono 13) in
>> case the selected font (DejaVu Sans Mono) doesn't support a char.
> So that means the problem is not with DejaVu Sans Mono, it's with the
> fallback font, right?


I'm looking at xdisp.c now. When I set this:

    it->max_ascent = 0;
    it->max_descent = 0;

the problem disappears. Of course, it causes a problem in places where
ascent and descent are actually used, like for displaying images. I just
need to figure out how it->max_ascent gets computed from glyph->descent.

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