My problem is:

I have a QMainWindow application with many child windows.
In this application i can open project files which contains many child windows and i have a QAction with which i can close the project(close all child windows). So far so good.
But when i set the shortcut of this action to CTRL+W i get in trouble with the qt standard shortcuts, where this shortcut is used to close one child window.

So is there a way of disabling these standard shortcuts?
Or is the only solution to install a keyeventfilter?