ImpEditView::SetCursorAtPoint tiled rendering: avoid partial selections

Same problem as in the previous commit, just for mouse move. Previously
when selecting "abc" with the mouse only one or zero letter got selected
as the mouse moved, now it's properly the whole afffected string.

Change-Id: I025dbd71fc02a0c93a532ca188836ffb957d6b35
(cherry picked from commit c6f03d6f)

editeng/source/editeng/impedit.cxx

@@ -1531,8 +1531,8 @@ bool ImpEditView::SetCursorAtPoint( const Point& rPointPixel )
     EditPaM aPaM = pEditEngine->GetPaM(aDocPos);
     bool bGotoCursor = DoAutoScroll();
 
-    // aTmpNewSel: Diff between old and new, not the new selection
-    EditSelection aTmpNewSel( GetEditSelection().Max(), aPaM );
+    // aTmpNewSel: Diff between old and new, not the new selection, unless tiled rendering
+    EditSelection aTmpNewSel( isTiledRendering() ? GetEditSelection().Min() : GetEditSelection().Max(), aPaM );
 
     // #i27299#
     // work on copy of current selection and set new selection, if it has changed.