mctrl
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[Bug] ...
(mCtrl-0.11.5) debug, 64bit, gcc compiler, Windows-64bit
Occurs at the moment of tab movement, this is unhealthy behavior.

It's not clear what issue you are trying to report. Is the problem the color splotching in what should be a gray background?
This is obviously a custom application that you have written and are using to host the control, since the title bar says "ProportionalTextEditor". Can you reproduce this with the bundled "example-mditab" and/or "example-mditab-dwm" sample applications? I cannot. If you cannot reproduce this with the bundled sample applications, please post your code that reproduces the problem.