CTRL + Left Click event issue

Hello,

I am facing an issue with the mouse events when pressing together the Ctrl key and the left mouse button.

Indeed, when pressing the Ctrl key, and clicking the left mouse button, the mouse move events and mouse release events are not handled.

It can be reproduced with the "Mouse Button Tester" example provided with Qt:

• Press the Ctrl key
• Press the left mouse button: The app shows that left button is pressed
• Release the left mouse button while keeping the Ctrl key pressed: The app does not show this event

This happens with Qt 5.12 on macOS 10.13+.

It behaves properly with Qt 5.9, i.e. when releasing the left mouse button, the app shows that the left button was released.

Notes: When pressing the right mouse button, it behaves properly as well.

Sebastien