[Bug 55500] [sna gen4 w/a] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #163 from Edward Sheldrake <ejsheldrake at gmail.com> ---
I have been experimenting with various numbers in the code in comment #157
without really discovering anything useful. I think any change that slows
things down decreases the chances of observing any corruption, but might not
necessarily fix the problem completely.

With current git + MAX_FLUSH_VERTICES=6, gnome-terminal suffers from the text
corruption, firefox is bad, but KDE4 konqueror and MiniBrowser from webkitgtk3
seem to display the same webpages perfectly fine. The other thing I have
noticed is that under this setup, I can make gedit suffer from the text
corruption if I set an italic (and not monospaced) font - in that case, almost
every line of the text file displayed will show some corruption immediately
after changing to the italic font.

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