How to debug a Qt library to find out which draw the UI element?
I’m learning https://github.com/KDAB/KDDockWidgets. I forked here for updating the example code (https://github.com/mrviit/KDDockWidgets). I also update the code changes for this issue (https://github.com/KDAB/KDDockWidgets/compare/2.1…mrviit:KDDockWidgets:2.1). The result app draw a strange rectangle that I want to change/disable as below image:
