When dragging for resize geometry or main window, window flashes

[tkbd]

This problem occurs in v2.1.4.x
Compared behavor of Wings3D 2.1.3 and Wings3D 2.1.4.1 for this problem.
As a simple example, divide horizontaly main window by two parts,Geometry is upper, Log windows is below.

In 2.1.3 this is OK
As move the separator up and down, the geometry content of v 2.1.3 scales smoothly according to the height of the window.
Also,Drag the lower right corner of the window to change the size of the entire window.
The contents of Geometry is temporarily become keep filled while dragging for resize white.
This is not a problem.

But,In 2.1.4.1 is NG
As move the separator up and down,The content of geometry window flickers violently.
Also,Drag the lower right corner of the window ,it more blinks white appears.

This problem occurs when the Geometry/Mainwindow size is dynamically changed.
Intense flashing would be bad for eyes a bit...


Wings3D 2.1.4.1
OSX 10.11.6