lok sc: Don't depend on the OutputDevice existence when invalidating.

We know that the drawinglayer operates in 100th of millimetre, and that we
need twips for LOK.

Change-Id: I8813f936ab66eaca4d6b9c03341e090d703decb8

svx/source/svdraw/sdrpagewindow.cxx

@@ -36,7 +36,7 @@
 #include <osl/mutex.hxx>
 #include <svx/fmview.hxx>
 #include <basegfx/matrix/b2dhommatrix.hxx>
-
+#include <sfx2/lokhelper.hxx>
 
 using namespace ::com::sun::star;
 
@@ -409,7 +409,23 @@ void SdrPageWindow::RedrawLayer(const SdrLayerID* pId,
 // Invalidate call, used from ObjectContact(OfPageView) in InvalidatePartOfView(...)
 void SdrPageWindow::InvalidatePageWindow(const basegfx::B2DRange& rRange)
 {
-    if(GetPageView().IsVisible() && GetPaintWindow().OutputToWindow())
+    if (comphelper::LibreOfficeKit::isActive())
+    {
+        // we don't really have a paint window with LOK; OTOH we know that the
+        // drawinglayer units are 100ths of mm, so they are easy to convert to
+        // twips
+        const Rectangle aRect100thMM(
+            static_cast<long>(floor(rRange.getMinX())),
+            static_cast<long>(floor(rRange.getMinY())),
+            static_cast<long>(ceil(rRange.getMaxX())),
+            static_cast<long>(ceil(rRange.getMaxY())));
+
+        const Rectangle aRectTwips = OutputDevice::LogicToLogic(aRect100thMM, MapUnit::Map100thMM, MapUnit::MapTwip);
+
+        if (SfxViewShell* pViewShell = SfxViewShell::Current())
+            SfxLokHelper::notifyInvalidation(pViewShell, aRectTwips.toString());
+    }
+    else if (GetPageView().IsVisible() && GetPaintWindow().OutputToWindow())
     {
         const SvtOptionsDrawinglayer aDrawinglayerOpt;
         vcl::Window& rWindow(static_cast< vcl::Window& >(GetPaintWindow().GetOutputDevice()));