On Mac, selecting a document in the dropdown sorted list of open documents changes the document view but doesn't set the focus and window title accordingly. One needs to click in the editor view to finalise the operation. This can be annoying and hinder productivity. It is not related to the QPA plugin in use (it happens with the Cocoa and the XCB backends).
I've linked this to the use of a QSignalBlocker in Sublime::Container::setCurrentWidget(); removing that instance (on Mac) makes the issue disappear.