Missing focus when opening single file on MacOS

This is a MacOS only issue - works fine on Linux/Windows.

Steps to reproduce:

• open a single file (self-explaining when using a file containing code like .cpp, .h, .qml - but problem exists for all single files that aren't project files) - won't matter if you're using FileDialog/Mouse or FileDialog/Command+Shift+g to specify path
• without (left-) clicking onto Creator or one of it's subwidgets perform a right click on one of the members of the opened file

Current behaviour:

• context menu items are almost all disabled because editor had no focus when clicking

Expected behaviour:

• context menu items should be enabled depending on the content of the editor