Scroll bar animations when using double buffering

Hello!

I am drawing a grid in the cells of which the images will be located 
(wx.Bitmap).

I need to use double buffering to get rid of the flickering (the flickering 
appears when I draw the cursor (a square on the selected cell)).

I noticed that when using double buffering, the EVT_PAINT handler is called 
even when I hover over the scrollbar. In this case, the animation of the 
scroll bar (smooth color change) occurs in jerks. Without double buffering, 
the animation is smooth.

Is there a way to solve this problem?

Code: https://ideone.com/odZ2dp

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