tdf#115420 WIN clean up WinSalFrames DC handling
We still don't return a SalGraphics object from AcquireGraphics without a valid DC. But internally we keep the WinSalGraphics objects around, so we now have to verify the DC before using it. In the end this also fixes the leak of the threaded SalGraphics of the frame. Change-Id: I267c96c04b7d00cb66a6c84c63d1373ebe0f529f Reviewed-on: https://gerrit.libreoffice.org/50908Tested-by: Jenkins <ci@libreoffice.org> Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
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