Creator looses text cursor and mouse wheel after debugging crash

When a debugging session runs into an assertion or gdb terminates, Creator randomly

• looses the text cursor. The current position is no longer shown, while the current line number remains highlighted.
• becomes unresponsive to the mouse wheel

To reproduce:

• debug any graphical user interface
• instead of properly ending the debugging session, type killall gdb on the command line
• text cursor becomes invisible, mouse wheel is ignored.