Prevent potential crashes due to invalid pointers left in text

containers and layout managers when their respective layout manager
and text storage are deallocated.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@35178 72102866-910b-0410-8b05-ffd578937521

Source/NSTextStorage.m

@@ -61,6 +61,8 @@ static NSNotificationCenter *nc = nil;
 - (void) dealloc
 {
   [self setDelegate: nil];
+  [_layoutManagers makeObjectsPerformSelector: @selector(setTextStorage:)
+				   withObject: nil];
   RELEASE (_layoutManagers);
   [super dealloc];
 }