* Headers/AppKit/NSTableView.h: Add _isValidating

* Source/NSCell.m (+initialize): Expose title binding.
	* Source/NSOpenPanel.m (-runModal): Use _directory if it is set.
	* Source/NSTableView.m (-validateEditing): Check _isValidating to
	prevent recursive calls into validateEditing.
	* Source/NSTabView.m (-initWithCoder:): Set _selected_item to
	NSNotFound.
	* Source/NSView.m (-addSubview:): Do not throw an exception when
	adding a nil subview, just ignore it.  This matches behavior on
	Cocoa.



git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@35562 72102866-910b-0410-8b05-ffd578937521

Source/NSCell.m

@@ -63,6 +63,8 @@
 #import "AppKit/NSTextContainer.h"
 #import "AppKit/NSView.h"
 #import "AppKit/NSWindow.h"
+#import "AppKit/NSKeyValueBinding.h"
+#import "GSBindingHelpers.h"
 #import "GNUstepGUI/GSTheme.h"
 #import "GSGuiPrivate.h"
 
@@ -116,6 +118,9 @@ static NSColor *dtxtCol;
                name: NSSystemColorsDidChangeNotification
              object: nil];
       [self _systemColorsChanged: nil];
+#if OS_API_VERSION(GS_API_MACOSX, GS_API_LATEST)
+      [self exposeBinding: NSTitleBinding];
+#endif
     }
 }
 
@@ -216,6 +221,8 @@ static NSColor *dtxtCol;
 
 - (void) dealloc
 {
+  // Remove all key value bindings for this object.
+  [GSKeyValueBinding unbindAllForObject: self];
   TEST_RELEASE (_contents);
   TEST_RELEASE (_cell_image);
   TEST_RELEASE (_font);