Yet more update:
Successfully installed Qt 4.5.1 from
https://launchpad.net/~kubuntu-experimental/+archive/ppa/
but still no break through.
At a closer look after all those updates, the issue seems to be reduced:
+ previously kmail was affected (view and composer), looks good now
+ konqueror:
* scrolling only broken an certain web pages
* some artifacts disappear after a short delay
- kate: forward scroll OK, backward scroll fails to repaint: areas remain
white.
re konqueror: problems are reproducable mostly on pages that combine fixed
positions with scrollable content. A funny effect is reproducable on this page:
www.opodo.co.uk (no advertizing intended): some part of the form consistently
fails to repaint during scrolling (the part containing line edits).
Also when searching within a page, repaint frequently fails.
My current belief is: this bug is actually a mixture of several bugs, some of
which
might have been fixed in Qt 4.5.1 or KDE 4.2.3. Remaining bugs could actually
be bugs of konqueror and kate respectively.
--
(Needs UXA) painting artifacts after qt4.5 upgrade on intel chipset
https://bugs.launchpad.net/bugs/338669
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