lok: do not recreate lok-drawview for every tile paint

This lets the ScLOKDrawView live long enough for non-tile painting
related invocation of its methods and hopefully those of its member objects.

This is a blind fix for the following crash:

/opt/collaboraoffice/program/../program/libsclo.so
	(anonymous namespace)::ScLOKProxyObjectContact::calculateGridOffsetForViewOjectContact(basegfx::B2DVector&, sdr::contact::ViewObjectContact const&) const
...
/opt/collaboraoffice/program/libmergedlo.so
	SdrTextObj::NbcSetOutlinerParaObjectForText(std::unique_ptr<OutlinerParaObject, std::default_delete<OutlinerParaObject> >, SdrText*)
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/svx/source/svdraw/svdotext.cxx:1379
/opt/collaboraoffice/program/libmergedlo.so
	sdr::properties::TextProperties::ItemSetChanged(SfxItemSet const&)
		/opt/rh/devtoolset-10/root/usr/include/c++/10/bits/unique_ptr.h:360
/opt/collaboraoffice/program/libmergedlo.so
	sdr::properties::RectangleProperties::ItemSetChanged(SfxItemSet const&)
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/svx/source/sdr/properties/rectangleproperties.cxx:54
/opt/collaboraoffice/program/libmergedlo.so
	sdr::properties::DefaultProperties::SetObjectItem(SfxPoolItem const&)
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/svx/source/sdr/properties/defaultproperties.cxx:120
/opt/collaboraoffice/program/libscfiltlo.so
	XclTxo::XclTxo(XclExpRoot const&, EditTextObject const&, SdrObject*)
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/include/svl/cenumitm.hxx:26
/opt/collaboraoffice/program/libscfiltlo.so
	XclObjComment::XclObjComment(XclExpObjectManager&, tools::Rectangle const&, EditTextObject const&, SdrCaptionObj*, bool, ScAddress const&, tools::Rectangle const&, tools::Rectangle const&)
		/opt/rh/devtoolset-10/root/usr/include/c++/10/bits/unique_ptr.h:179
/opt/collaboraoffice/program/libscfiltlo.so
	XclExpNote::XclExpNote(XclExpRoot const&, ScAddress const&, ScPostIt const*, rtl::OUString const&)
		/opt/rh/devtoolset-10/root/usr/include/c++/10/tuple:137
/opt/collaboraoffice/program/libscfiltlo.so
	ExcTable::FillAsTableXml()
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/include/rtl/ref.hxx:65
/opt/collaboraoffice/program/libscfiltlo.so
	ExcDocument::ReadDoc()
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/sc/source/filter/excel/excdoc.cxx:747
/opt/collaboraoffice/program/libscfiltlo.so
	XclExpXmlStream::exportDocument()
		/home/collabora/jenkins/workspace/build_linux_co-2021_online_snapshot/sc/source/filter/excel/xestream.cxx:1107
/opt/collaboraoffice/program/libooxlo.so

Change-Id: I248395cca1e2da37208fc449aca731175a5aa368
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/133914
Tested-by: Andras Timar <andras.timar@collabora.com>
Reviewed-by: Andras Timar <andras.timar@collabora.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/sc/source/ui/view/gridwin4.cxx b/sc/source/ui/view/gridwin4.cxx
index 2580b25fafd2..0c697bf085ef 100644
--- a/sc/source/ui/view/gridwin4.cxx
+++ b/sc/source/ui/view/gridwin4.cxx
@@ -1571,13 +1571,16 @@ void ScGridWindow::PaintTile( VirtualDevice& rDevice,
     {
         bool bPrintTwipsMsgs = comphelper::LibreOfficeKit::isCompatFlagSet(
                 comphelper::LibreOfficeKit::Compat::scPrintTwipsMsgs);
-        mpLOKDrawView.reset(bPrintTwipsMsgs ?
-            new ScLOKDrawView(
-                &rDevice,
-                mrViewData) :
-            new FmFormView(
-                *pModel,
-                &rDevice));
+        if (!mpLOKDrawView)
+        {
+            mpLOKDrawView.reset(bPrintTwipsMsgs ?
+                new ScLOKDrawView(
+                    &rDevice,
+                    mrViewData) :
+                new FmFormView(
+                    *pModel,
+                    &rDevice));
+        }
 
         mpLOKDrawView->SetNegativeX(bLayoutRTL);
         mpLOKDrawView->ShowSdrPage(mpLOKDrawView->GetModel()->GetPage(nTab));