return value from that will be used for the minimum size. Added
wx.FIXED_MINSIZE flag for when you would like the old behavior but you
should only need it when your desired size is smaller than the item's
-GetBestSize().
+GetBestSize. When a window is added to a sizer it's initial size, if
+any, is set as the window's minimal size using SetSizeHints if there
+isn't already a minimal size.
PlatformInfo