Render Glitch when Maximizing RibbonWindow with SizeToContent Enabled

[changbowen]

I'm using the latest build from AppVeyor. Looks like there are some glitch in rendering of the RibbonWindow when SizeToContent of the RibbonWindow property is not set to Manual (the default value). And the problem only surfaces when maximizing the window from the maximize button on the top-right corner: instead of showing a full-screen window, a window with black bars surrounded is shown.
Double-clicking the window title maximizes the window fine, and also fixes the problem for future maximizing of the single instance of the window. A manual resize also fixes the problem temporarily.
The below issue might be related.
#153

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Environment

• Fluent.Ribbon v5.0.0
• Windows 7 x64
• .NET Framework 4.5.2

[batzen]

Will have to fix this in ControlzEx, please see details there.