fix Skia flushing to screen on Windows (tdf#144145)

Should have been part of eb37b1e346f5651ce8e6848e51103a8986a57c36.

Change-Id: I25c5524fcea90ccc30d880451034d0fa1716b6f5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/121327
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>
diff --git a/vcl/skia/win/gdiimpl.cxx b/vcl/skia/win/gdiimpl.cxx
index 6cc4acb..914e7db 100644
--- a/vcl/skia/win/gdiimpl.cxx
+++ b/vcl/skia/win/gdiimpl.cxx
@@ -76,7 +76,7 @@ void WinSkiaSalGraphicsImpl::performFlush()
    if (mWindowContext)
    {
        if (mDirtyRect.intersect(SkIRect::MakeWH(GetWidth(), GetHeight())))
            mWindowContext->swapBuffers(&mDirtyRect);
            flushSurfaceToWindowContext(mDirtyRect);
        mDirtyRect.setEmpty();
    }
}