Patch: Implement Dialog modality

[Tom Tromey]

>>>>> "Tom" == Thomas Fitzsimmons <fitzsim@redhat.com> writes:

Tom> This patch implements Dialog modality and fixes the following problems
Tom> with windows:

Looks great to me.  Just a couple questions.

Tom> +    insets = new Insets (latestInsets.top,
Tom> +			 latestInsets.left,
Tom> +			 latestInsets.bottom,
Tom> +			 latestInsets.right);

There's no synchronization around these uses of latestInsets.  That's
fine if the code is robust in the face of race conditions, which I
think it is.  It could use a comment about this somewhere, though.

Tom>    public void show()
Tom> [ ... ]
Tom> +    // Show visible owned windows.
Tom> +    synchronized (ownedWindows)
Tom> +      {

I wonder if this code should synchronize on the tree lock instead.
(It's fine to check it in as-is and then go back and change it later,
as we're already using ownedWindows as a lock elsewhere.  If it does
need to be changed then we can change it everywhere at once.)

Tom