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

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

(Cherry-picked from the commit ed031895)

Conflicts:
	svtools/source/control/ruler.cxx

Change-Id: I161237cdb4941c0eaf934223b078acd94d72e21d
Reviewed-on: https://gerrit.libreoffice.org/18507Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

svtools/source/control/ruler.cxx

@@ -2344,6 +2344,12 @@ bool Ruler::StartDocDrag( const MouseEvent& rMEvt, RulerType eDragType )
         // update ruler
         if ( mbFormat )
         {
+            if (!IsReallyVisible())
+            {
+                // set mpData for ImplDocHitTest()
+                ImplFormat(*this);
+            }
+
             Invalidate(INVALIDATE_NOERASE);
         }