<AWT Dev> 6705345: Enable multiple file selection in AWT FileDialog: also for the new GtkFileDialogPeer.

[Costantino Cerbo]

Hallo!

I've just seen this bug fix:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6705345

After the patch for the GtkFileDialogPeer is committed I can also
extend its functionalities to handle multiple file selection.
What about directory-only selection in FileDialog? Also in this case,
I can provide already a patch for the GtkFileDialogPeer (but not for
the other OSs).

Cheers,
Costantino