tdf#92145: Writer table rows/columns can't be resized

with disabled rulers. (This fix was suggested by Tomaž Vajngerl.)

Change-Id: I161237cdb4941c0eaf934223b078acd94d72e21d

svtools/source/control/ruler.cxx

@@ -2338,6 +2338,12 @@ bool Ruler::StartDocDrag( const MouseEvent& rMEvt, RulerType eDragType )
         // update ruler
         if ( mbFormat )
         {
+            if (!IsReallyVisible())
+            {
+                // set mpData for ImplDocHitTest()
+                ImplFormat(*this);
+            }
+
             Invalidate(InvalidateFlags::NoErase);
         }