suppress libpng warnings on load

Author: Janne Härkönen

src/robotide/widgets/images.py

@@ -59,7 +59,12 @@ def get_image_by_name(self, name):
 
     def _load_image(self, name):
         path = self._get_img_path(name)
-        return wx.Image(path, wx.BITMAP_TYPE_PNG).ConvertToBitmap()
+        noLog = wx.LogNull()
+        # Suppress warnings generated by recent libpng versions.
+        # The png files themselves are most likely ok.
+        img = wx.Image(path, wx.BITMAP_TYPE_PNG).ConvertToBitmap()
+        del noLog
+        return img
 
     def _get_img_path(self, name):
         return os.path.join(self._BASE, name)