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Show the given text in a scrollable window with a 'close' button.
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parent - parent of this dialog
title - string which is title of popup dialog
text - text to display in dialog
wrap - type of text wrapping to use ('word', 'char' or 'none')
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_utest - bool; don't wait_window when running unittest.
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parent - parent of this dialog
title - string which is the title of popup dialog
text - text to display in this dialog
wrap - type of text wrapping to use ('word', 'char' or 'none')
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