[Bug 295079] [NEW] glitches in qt4 apps

[mhinsch]

Public bug reported:

Binary package hint: libqtgui4

All of this applies to Ubuntu 8.10.

Several qt4 apps show graphical glitches:

- The highlight of menu items which follows the mouse pointer lags
behind so that multiple menu items are highlighted (and sometimes not
even the one currently selected). This occurs for example in KJots and
Kate. Interestingly as well in Mathematica although it comes with its
own version of Qt4.

- When changing selection in treewidgets sometimes the displayed
selection state gets out of sync with the actual selection. That is,
either multiple items or not the one actually selected are highlighted
(KJots).

Some additional information:

- I could observe the problems only when running the programs in
question in gnome/compiz, under kde4 everything seems to work fine.

- A simple redisplay of the app (e.g. when switching to a different
desktop and back) brings it back into a sane state.

- In my own program (a tiny kjots clone) written in qtruby the second
problem becomes so bad that the program basically is unusable. It turns
out that the likelihood of displayed and internal state in TreeWidget
getting out of sync depends somehow on the timing of events. I catch the
signal emitted when the selection in the TreeWidget changes to update a
TextWidget. The more stuff is done during processing that event the more
likely it is that the visual update is skipped.

** Affects: qt4-x11 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
glitches in qt4 apps
https://bugs.launchpad.net/bugs/295079
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