Window issue with two monitors when "show window contents while dragging" is disabled
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Description
@Kryptos-FR commented on [Thu Nov 10 2016](https://github.com/microsoft/WPF-Samples/issues/37)
Hello,
The recent DPI support in WPF (starting with .Net 4.6.2) is really nice. It helped us improve a lot our application.
However when moving a window from a monitor to another with a different DPI, the rendering is broken when the system advanced option *show window contents while dragging* is disabled. This issue can be reproduced with the **PerMonitorDPI** samples of this repository.
Here are captures of what is happening:
*moving from a monitor with 100% scale to another monitor with 150% scale*
*moving from a monitor with 150% scale to another monitor with 100% scale*
Also note that this issue still happen in some cases even if the option *show window contents while dragging* is enabled. When using **Win+Arrows** keyboard shortcut to move the window to another monitor.
I tried to workaround it by forcing WPF to recalculate the layout or even with p/invoke some native Win32 API but it doesn't fix this.
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