debugging experience on MacOS

How to reproduce:

• step through the simple_gdbtest_app that comes with the Qt Creator source.

That doesn't work:

• When doing nothing, after 20 seconds appears the error message "The gdb process has not responded to a command within 20 seconds..." One can click "Give gdb more time" and everything is fine. Still annoying.
• testArray: The tree of the array d is collapsing at every step. Drives me insane.