Comment 7 for bug 696761

merged other bugs into this one as they are manifestations of the same set of problems, all formed by the fact that DWT dialog loops are "too smart": they keep running the main loop which, while otherwise brilliant and unique as far as i know in a Windows UI library, can lead to a few odd issues.

1) one top-level window shouldn't be allowed to display more than one modal dialog at the same time.

2) the parent of a dialog shouldn't be allowed to be closed until the dialog has been dismissed; or alternatively, the dialog should be closed right before closing its parent.

3) message boxes, which aren't as "smart" as our modal dialogs, should obey rules 1 & 2 as well.