Implemented textContainerChangeTextView:

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@8483 72102866-910b-0410-8b05-ffd578937521

Source/NSLayoutManager.m

@@ -537,10 +537,36 @@ static NSComparisonResult aSort(GSIArrayItem i0, GSIArrayItem i1)
 	actualCharacterRange: NULL];
 }
 
-// Called by NSTextContainer whenever its textView changes.  Used to
+/* Called by NSTextContainer whenever its textView changes.  Used to
-// keep notifications in synch.
+   keep notifications in synch. */
 - (void) textContainerChangedTextView: (NSTextContainer*)aContainer
 {
+  /* It only makes sense if we have more than one text container */
+  if (_textContainersCount > 1)
+    {
+      unsigned index;
+      
+      index = [_textContainers indexOfObjectIdenticalTo: aContainer];
+      
+      if (index != NSNotFound)
+	{
+	  if (index == 0)
+	    {
+	      /* It's the first text view.  Need to update everything. */
+	      int i;
+	      
+	      _firstTextView = [aContainer textView];
+	      
+	      for (i = 0; i < _textContainersCount; i++)
+		{
+		  NSTextView *tv;
+
+		  tv = [[_textContainers objectAtIndex: i] textView]; 
+		  [tv _updateMultipleTextViews];
+		}
+	    }
+	}
+    }
 }
 
 // Sent from processEditing in NSTextStorage. newCharRange is the