[Tracker] crashes in BBitmap::Bounds ()

[diver]

This is hrev40968, gcc4 hybrid.

Tracker crashes after switching from 24bit workspace with attached image as background (centered) to 32bit workspace with no background set.

Thread 9968 caused an exception: Segment violation
[...]
0x002e2e69 in BBitmap::Bounds () from /boot/system/lib/libbe.so
(gdb) bt
#0  0x002e2e69 in BBitmap::Bounds () from /boot/system/lib/libbe.so
#1  0x004fc2e1 in BPrivate::BackgroundImage::ScreenChanged () from /boot/system/lib/libtracker.so
#2  0x00510c4c in BPrivate::BDeskWindow::ScreenChanged () from /boot/system/lib/libtracker.so
#3  0x003969ef in BWindow::DispatchMessage () from /boot/system/lib/libbe.so
#4  0x003929a1 in BWindow::task_looper () from /boot/system/lib/libbe.so
#5  0x002c566c in BLooper::_task0_ () from /boot/system/lib/libbe.so
#6  0x0063ca5d in thread_entry () from /boot/system/lib/libroot.so
#7  0x70184fec in ?? ()
(gdb)

Found by mrNoisy.

[diver]

wallpaper

[stpere]

fixed in hrev44125. Thanks!