Linux GTK modal dialogs are not really modal

[magreenblatt]

Original report by Dave Tarkowski (Bitbucket: David Tarkowski).

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On Linux, if I bring up a GTK+ modal dialog, such as a file dialog, it isn’t really modal – events are passed to the underlying application.

Using the cefclient application:

1. Go to tests->Other tests->Dialog
2. Click on a file dialog button
3. While the file dialog is open, click on the same button two or three times.
4. Click “Cancel” from the file dialog. A new dialog will be created immediately.

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