Andrey Skvortsov <andrej.skvortzov@gmail.com> [Tue, 20 Jun 2017 18:57:29 +0300] rev 1700
fix problem with hidden FindInPou dialog with wxPython 3.0 on Windows
FindInPou.IsShown() returned True, but dialog was hidden.
At same time On GNU/Linux with wxPython 3.0 there wasn't such problem.
So it's Windows specific.