[Debugger] crashes in SourceView::TextView::MouseMoved ()

[diver]

This is hrev42214, gcc2hybrid.

Dragging selected text in the Images tab reliably crashes Debugger.

Thread 619 caused an exception: Segment violation
[Switching to team /boot/home/Desktop/Debugger (586) thread w>/boot/system/apps/Terminal (5 (619)]
0x002f625b in SourceView::TextView::MouseMoved ()
(gdb) bt
#0  0x002f625b in SourceView::TextView::MouseMoved ()
#1  0x005c4831 in BWindow::DispatchMessage () from /boot/system/lib/libbe.so
#2  0x002fa85e in TeamWindow::DispatchMessage ()
#3  0x005c9194 in BWindow::task_looper () from /boot/system/lib/libbe.so
#4  0x004f4f7f in BLooper::_task0_ () from /boot/system/lib/libbe.so
#5  0x008fc8c7 in thread_entry () from /boot/system/lib/libroot.so
#6  0x70247fec in ?? ()
(gdb)

[anevilyak]

Fixed in hrev42217.