Cheese - Bug 647229

My first experience of contribution to Cheese was a patch that intend to fix the bug:

The first thing that I noticed was that this bug happens only when the user closes the Preferences dialog with the escape key... But, why? That happens because the GtkDialog has a "close" signal that by default is called when the escape key is released and as consequence it also triggers the delete-event, that destroys the dialog.
After few research I discovered that exists a way to handle exactly this kind of issue. There is a method at GtkWidget called gtk_widget_hide_on_delete(), so, what I did was connect this method with the handle of "delete-event" signal. This ensure that the escape key has the same result as the click on the "Close" button.
Here is the patch.

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