Qt GUI thread hangs up

The Qt version used by the Windows desktop program is Qt 5.6.2. Open the program interface. Simply click the button on the interface or right click to pop up the right-click menu. Without further operation, the software will become hangs up within one minute and it cannot be recovered.

After discovering this situation, in order to eliminate the problem introduced by the business logic code of the program itself, a simple GUI window program was written with the version of Qt 5.12.0. The window contains only one "QTextEdit", run the interface, and perform the following steps.

1, randomly enter characters in the "QTextEdit"

2, right click in the "QTextEdit"

3. Switch with "alt+tab"

4. repeat steps above

After one minute, the demo program showed no response. At this time, the window manager could drag, but the "QTextEdit" could not respond to any operation.

At the same time, the test program written in GTK does not exist this program in the same system environment*.