Improvements by Hans Breuer:
* gdk/win32/gdkwindow.c (RegisterGdkClass): New function * gdk/win32/gdkwindow.c (gdk_window_new): Use it. Don't set the CS_?REDRAW flags as they cause lots of (late) redraws when "show window contents while dragging" is turned on. Allocate at least one unique class for every GdkWindowType. If support for single window-specific icons is ever needed (eg. Dialog specific), every such window should get its own class.
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