Resolves: fdo#51908 drop word/char count cache when numbering rule changes

Word Count doesn't update immediately when Numbering is applied or removed

Change-Id: I44ac2313cdeef92e6394b86316ff1037fc8d8f18

sw/source/core/txtnode/ndtxt.cxx

@@ -2389,6 +2389,8 @@ void SwTxtNode::NumRuleChgd()
         SvxLRSpaceItem& rLR = (SvxLRSpaceItem&)GetSwAttrSet().GetLRSpace();
         NotifyClients( &rLR, &rLR );
     }
+
+    SetWordCountDirty( true );
 }
 
 // -> #i27615#
@@ -3840,6 +3842,8 @@ void SwTxtNode::RemoveFromList()
         mpList = 0;
         delete mpNodeNum;
         mpNodeNum = 0L;
+
+        SetWordCountDirty( true );
     }
 }