Change on NSControl

[Fred Kiefer]

Hi Quentin,

could you please explain the change you made to the mousedown: method on 
NSControl? The change here looked rather strange to me, as the only 
super implementation for mouseDown: I could find was in NSResponder. So 
I searched around a bit more and found that extension of NSView in the 
GSToolbar.m file. This code structure isn't obvious, at least not to me. 
Perhaps you could write some comments on the toolbar validation to the 
mailing list and add them later on to the files, so this information 
wont get lost. Your change to the tracking rect handling may be obvious 
to you, but again it isn't to me.

The problem here is that if we don't document what is the intention, 
somebody else may break it later on, as they just don't know about it.

Fred

BTW: There are also a few compiler warnings from toolbar related 
classes. Could you please fix them.