NSTextView NSTEXTVIEW_SYNC patch

[David Ayers]

Hello all,

while investigating some of the mechanics of NSTextView I ran across the
_syncTextViewsByCalling implementation. Eventhough the comments mention:

   We need to explicitly call the methods - we can't copy the flags
   directly from one textview to another, to allow subclasses to
   override eg setEditable: to take some particular action when
   editing is turned on or off.

they don't fully honor the fact, that the layout manager my have different
subclasses of NSTextView since the implementation caches the method pointer
to the current NSTextView and applies it to all textContainers. Here is a
patch using NSInvocation's invokeWithTarget: instead. (It also replaces the
NSTEXTVIEW_SYNC macro call by using a version that doesn't need a
parameter.)

I don't have a "real" Test-App that uses a layout manager with multiple
NSTextViews. Is there one around? Or any easy accesible source from which I
could quickly create a GSTest bundle?

Cheers,
Dave.