Graphical corruption in some plasma applets after upgrade to Qt 4.5

[Michael Marley]

Binary package hint: kdebase

On Kubuntu Jaunty x64, some plasma widgets are drawn with corrupted graphics after the upgrade to Qt 4.5. The applets I have seen exhibit this problem are the Folder View applet and the semicircular applet at the top right corner of the display. Applets that should be partially transparent display with a black bar around the sides. Additionally, the semicircle and its menu have differing shades of gray both in the semicircle and the menu. I have attached a screenshot demonstrating the problem.

[Jonathan Thomas (echidnaman)]

If you update everything (Qt 4.5 and KDE 4.2.1, though 4.2.1 is still trickling in) and clear the plasma pixmap cache (rm /var/tmp/kdecache-USERNAME/kpc/plasma*) things should improve a lot. The folderview weirdness and one-pixel-thick gaps in various plasma-themed things should go away. The cashew is still funky for me, at least.

[Jonathan Thomas (echidnaman)]

The cashew being the unofficial-official name for the Plasma-icon-toolbox-quartercircle in the top right corner of the screen

[Michael Marley (mamarley)]

I figured that out. :-) Definitely a better name than what I was calling it. It has improved though, now the borders are gone and it just has the improper levels of transparency problem.

[Giovanni Masucci (gio-grifis)]

I have hoped that the update to kde 4.2.2 would have solved this (since it has solved A LOT of other qt 4.5 regressions) but I have to confirm that the problem is still there. Everything seems fine with trunk (kde 4.3).

[Michael Marley (mamarley)]

These problems seem to be fixed with QT 4.5.1 in Karmic. Can anyone confirm this, before I close the bug?

[Jonathan Thomas (echidnaman)]

Barely anyone is running Karmic at the moment, (Qt issues like those of this morning are... inconvenient at best) so it may be a bit before anyone confirms. Most devs are probably doing all of their development in chroots as of now.
I would not be surprised if Qt 4.5.1 did fix it, though.

[Michael Marley (mamarley)]

I am not using it as my primary system. I have just installed it on an old box I had laying around by installing Jaunty and changing all of the references in /etc/apt/sources.list from "jaunty" to "karmic"

[Giovanni Masucci (gio-grifis)]

Fixed for me with qt 4.5.1 on jaunty. Could qt 4.5.1 enter the proposed repository to be even more tested and then enter jaunty main repository? It's a bugfix release after all. It solves a lot of graphical corruption problems that afflicted kde 4.2.x with 4.5.0, from the cashew one to the window corruption happening with some windows (like when using kmail). It also solves a nasty bug I had with menu items in konqueror menu bar.

[Michael Marley (mamarley)]

I agree. Putting it in Jaunty proposed (or at least Backports) would be a very good idea. On my Karmic test box I haven't had any problems with it.

[Giovanni Masucci (gio-grifis)]

no 4.5.1 regressions so far, even for me. I know there was one regression, but it has already been solved with http://websvn.kde.org/trunk/qt-copy/patches/0279-svg-rendering-regression.diff
I guess karmick packages (and the backported packages I'm using) already have that patch... :-)

[Jonathan Thomas (echidnaman)]

Yeah, regressions were originally why we were against even backporting Qt 4.5.1. Qt hasn't always been the greatest at releasing regression-free, and since Qt affects so many things... you see the point.

But now it seems that most of the obvious regressions (svg rendering) have been found/patched, so we are going to be offering Qt 4.5.1 packages initially in the kubuntu-experimental PPA (https://edge.launchpad.net/~kubuntu-experimental/+archive/ppa/) If testing goes well there, then we will hopefully see a backport.

[Jonathan Thomas (echidnaman)]

I can confirm the fix with the Qt 4.5.1 packages from the kubuntu-experimental PPA.