application modality vs. window modality

There's a bug in Mozilla* that got me thinking. It might be very nice to have the ability to set a window ( a dialog or whatever ) as modal to a specific parent window. There are cases where you need a decision made in an application's window where other windows that are in that application don't need to be blocked.

Right now I'm pretty sure that all we have is the concept of application-wide modality. I think that right now you can create a transient dialog for a window but putting a grab on that window so that events can't be sent to the parent window doesn't work without blocking all of the windows in the app.

From an API standpoint I'm thinking along the same lines of how you set transient parents for dialogs.

What do people think? I think it would be a useful addition and it shouldn't be too tough to do from an implementation standpoint.


* The bug is for anyone who cares.

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