frontend: Use Q_OBJECT macro for BrowserDock

[cg2121]

Description

This is needed as the BrowserDock is a QObject.

Motivation and Context

Without this, #11784 fails to compile

How Has This Been Tested?

Compiled and ran OBS

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[Lain-B]

I suppose this is fine.

[PatTheMav]

This will require the source file to include the generated moc file as well, as adding Q_OBJECT will trigger such a pre-compilation iirc.

[cg2121]

Updated to also include the moc file.

[RytoEX]

Looks okay.

[PatTheMav]

Interesting that the "identity" of the final object is not inherited, even though it inherits from OBSDock which does have the Q_OBJECT decoration.

[Warchamp7]

Interesting that the "identity" of the final object is not inherited, even though it inherits from OBSDock which does have the Q_OBJECT decoration.

The Q_OBJECT macro tells Qt to generate MOC functions for the class and I don't think there's any way for it to automatically do that for something strictly based off subclassing.

This will require the source file to include the generated moc file as well, as adding Q_OBJECT will trigger such a pre-compilation iirc.

This is not actually required afaik because of AUTOMOC in the Cmake files, though Qt will detect when a moc file is included explicitly, which can prevent multiple definition errors (As I learned recently working on properties-view stuff)