[Bug 55500] [sna gen4] 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 #139 from Zdenek Kabelac <zdenek.kabelac at gmail.com> ---
Well I'm curious how this explains this -  I've taken current git -
changed the value to '44' - and I'm typing this text.  I could see a lot of
errors during text typing - but these errors seems to be somehow limited only
to certain regions of shown text.

It's not destroyed everywhere - only in some particularly piece and in
particular time - it's kind of weird defect to observe - and it also happen for
only some specific use-case 

i.e. my text edit 'fte' which is using  X drawing code has absolutely no issue
- all characters are always correct. 
But in firefox - typing this BZ I could see a lot of changing letters (usually
everything after 10 letter on the line is weirdly changing - like if the font
cache would be not working correctly.

Typing on keyboard shows rending bugs - as soon as right mouse button is hit -
everything is instantly redrawn correctly and pop window is shown.

Another thing I notice is -  I've about 20 lines of email headers in
thunderbird. And exactly only the 4th line is showing problems with letters -
even when I just move the mouse over the TB window - this text is being
continuously modified - but everything else in that window is without any
problem.

So if you say - there is hw bug - how is that  - it could very easily render
everything correctly ?

Why only certain portions of text have distortions - why it's not randomly
spread over the whole screen (which I'd have expected for time collisions)?

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