docs: Clarify "Show window contents while dragging" is required

On Windows, as Qt doesn't receive events.
KDAB · Jul 29, 2024 · d84d16b · d84d16b
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commit d84d16b
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diff --git a/docs/book/src/qpa-windows.md b/docs/book/src/qpa-windows.md
@@ -5,5 +5,10 @@ KDDockWidgets not only works fine on `Windows` it also implements some native fe
 - Support for native Windows drop shadow around the frame
 - Support mixing with MFC event loop
 
+## Known issues
+
+- Turning off "Show window contents while dragging" is not supported, as Qt won't receive
+  any mouse or window move event until mouse is released.
+
 Note: `MinGW` compiler is not tested, but probably works.<br>
 Note: KDDW is tested with Windows 10 and 11. `Windows 7` can be made to work, upon request.