Ilya Sinitsyn 85b37bea49 Fix GetBestSize() for hidden controls in wxGTK ...

gtk_widget_get_preferred_size() return zero size if the GTK widget is
hidden, so show it temporarily in order to find its real preferred size.

Add a unit test checking that the best size of a hidden wxChoice is now
determined correctly.

Closes https://github.com/wxWidgets/wxWidgets/pull/1587

2019-10-09 14:56:49 +02:00

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