Vadim Zeitlin 8fb1152eee Fix error about duplicate PNG image handler in the drawing sample ...

Add the handler earlier, as creating the handler main frame uses
wxArtProvider::GetBitmap() which can add the PNG handler on some
platforms (e.g. macOS, when using wxTangoArtProvider), so calling
wxImage::AddHandler() again after creating the frame could result in a
debug error message about adding the same handler twice.

2018-11-13 16:11:24 +01:00

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