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Issue with fonts on macosx


From: chad
Subject: Issue with fonts on macosx
Date: Wed, 15 May 2013 10:47:45 -0700

I'm seeing a subtle issue with emacs rendering (on macosx, with the
current bzr head and a build from 9 May) but only with certain
fonts. I'll file a bug report, but I'd like to both narrow it down
and see if anyone else has similar problems first.

With my normal setup, using a zenburn theme and the font Anonymous
Pro, I see graphical `turds' that look like font droppings (the
cyan bits) in long dired listings. I typically need to scroll down
a screen or two in a long listing to see them. Once they appear,
they seem to be stable even if I scroll them off the screen and
back on. Moving the cursor over the dropping clears it, but scrolling
the area off and back into the window will make them reappear.

This seems to be far more pronounced with the font Anonymous Pro
(http://www.marksimonson.com/fonts/view/anonymous-pro). I don't see
it at all with the default font, but I do see something like it
with courier. I'm posting here in the hope that other developers
can check and see if it happens on their system+font.

Here's an example with Anonymous Pro and the zenburn theme (the
cyan bits):


I see similar results starting from Emacs -Q, with the same font
(the orange bits):


I also see similar but not identical issues with courier (cyan
again), but only in places that look like maybe intentional aliasing
spots. I'm not knowledgeable about current font rendering techniques.
Is this screenshot working as intended?


Thanks in advance,
~Chad

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