Bug#711082: black boxes around widgets without composition

[Trek]

Package: libwebkitgtk-1.0-0
Version: 1.8.1-3.4
Tags: upstream

I have two rendering bugs with Midori and GtkLauncher on wheezy.

The first, black rectangles around gtk widgets are rendered in pages.
I have found similar bug reports and screenshots as reference:

http://i.imgur.com/b1gOZ.png
https://bugs.launchpad.net/midori/+bug/1092532

http://kalev.fedorapeople.org/midori_about_widgets.png
https://bugs.webkit.org/show_bug.cgi?id=79680#c3


The second, dragging text makes the box all black and dragging images
with alpha blending makes black the transparent parts of the image. The
bug may be related to this upstream bug (patched):

https://bugs.webkit.org/show_bug.cgi?id=108376


X runs without composition on an AGP ATI RV100 and AMD Athlon XP 2000+


After some test I found that the first bug disappear if I enable the
Composite extension in xorg.conf (that I had previously disabled) and
the second bug disappear if I also run a composition manager (xcompmgr)


Instelled packages:

libwebkitgtk-1.0-0  1.8.1-3.4 i386
libgtk2.0-0:i386  2.24.10-2 i386
libcairo2:i386  1.12.2-3 i386
xserver-xorg-video-radeon  1:6.14.4-8 i386
libdrm-radeon1:i386  2.4.40-1~deb7u2 i386
linux-image-3.2.0-4-686-pae  3.2.41-2+deb7u2 i386
midori  0.4.3+dfsg-0.1 i386

Video card:

Advanced Micro Devices [AMD] nee ATI RV100 QY [Radeon 7000/VE]
RADEON(0): Chipset: "ATI Radeon VE/7000 QY (AGP/PCI)" (ChipID = 0x5159)