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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https://bugs.launchpad.net/bugs/1098334

Title:
  [gen4 sna] Font corruption

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