no-lion-style fullscreen implementation for emacs 24.2, base on typester's patch.  The title-height will be set zero while 'ns-toggle-fullscreen.

emacs_24_2_fullscreen.patch

diff --git a/lisp/term/ns-win.el b/lisp/term/ns-win.el
index 1aad645..51e41df 100644
--- a/lisp/term/ns-win.el
+++ b/lisp/term/ns-win.el
@@ -942,6 +942,12 @@ See the documentation of `create-fontset-from-fontset-spec' for the format.")
 (add-to-list 'frame-creation-function-alist '(ns . x-create-frame-with-faces))
 (add-to-list 'window-system-initialization-alist '(ns . ns-initialize-window-system))
 
+;; for fullscreen 
+(declare-function ns-toggle-fullscreen-internal "nsfns.m" ())
+(defun ns-toggle-fullscreen ()
+  (interactive)
+  (ns-toggle-fullscreen-internal))
+
 
 (provide 'ns-win)
 
diff --git a/src/nsfns.m b/src/nsfns.m
index 9e89737..13496ce 100644
--- a/src/nsfns.m
+++ b/src/nsfns.m
@@ -1605,6 +1605,36 @@ If VALUE is nil, the default is removed.  */)
   return Qnil;
 }
 
+DEFUN ("ns-toggle-fullscreen-internal", Fns_toggle_fullscreen_internal, Sns_toggle_fullscreen_internal,
+       0, 0, 0,
+       doc: /* Toggle fulscreen mode */)
+    ()
+{
+    NSLog(@"ENTER FULLSCREEN");
+    struct frame *f = SELECTED_FRAME();
+    FRAME_NS_TITLEBAR_HEIGHT (f) = 0;
+    EmacsWindow *window = ns_get_window(f);
+    EmacsWindow *new_window = [window toggleFullscreen];
+    FRAME_NS_WINDOW(f) = new_window;
+
+
+    NSRect r = [new_window contentRectForFrameRect:[new_window frame]];
+    int cols = FRAME_PIXEL_WIDTH_TO_TEXT_COLS(f, r.size.width);
+    int rows = FRAME_PIXEL_HEIGHT_TO_TEXT_LINES(f, r.size.height);
+
+    change_frame_size (f, rows, cols, 0, 1, 0); /* pretend, delay, safe */
+    FRAME_PIXEL_WIDTH (f) = (int)r.size.width;
+    FRAME_PIXEL_HEIGHT (f) = (int)r.size.height;
+
+    f->border_width = [new_window frame].size.width - r.size.width;
+    FRAME_NS_TITLEBAR_HEIGHT (f) = 0;
+    
+    [[new_window delegate] windowDidMove:nil];
+
+    return Qnil;
+}
+
+
 
 DEFUN ("x-server-max-request-size", Fx_server_max_request_size,
        Sx_server_max_request_size,
@@ -2746,6 +2776,8 @@ be used as the image of the icon representing the frame.  */);
   defsubr (&Sx_show_tip);
   defsubr (&Sx_hide_tip);
 
+  defsubr (&Sns_toggle_fullscreen_internal);
+
   /* used only in fontset.c */
   check_window_system_func = check_ns;
 
diff --git a/src/nsterm.h b/src/nsterm.h
index 806cfcc..9a79b6a 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -128,14 +128,28 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 {
   NSPoint grabOffset;
 }
-@end
 
+-(EmacsWindow *)toggleFullscreen;
+
+@end
+/* 10.5 or below is not supported [NSWindow setStyleMask:], so require content swap hack */
 
 /* Fullscreen version of the above.  */
 @interface EmacsFSWindow : EmacsWindow
 {
+    EmacsWindow *normalWindow;
 }
+
+-(id)initWithNormalWindow:(EmacsWindow *)window;
+-(EmacsWindow *)getNormalWindow;
+
 @end
+ 
+// dummy for 10.5-
+#define NSApplicationPresentationDefault 0
+#define NSApplicationPresentationAutoHideDock (1 <<  0)
+#define NSApplicationPresentationAutoHideMenuBar (1 <<  2)
+
 
 /* ==========================================================================
 
diff --git a/src/nsterm.m b/src/nsterm.m
index a57e744..e36de0f 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -809,6 +809,12 @@ ns_focus (struct frame *f, NSRect *r, int n)
               [focus_view unlockFocus];
               [[focus_view window] flushWindow];
 /*debug_lock--; */
+              if (view) {
+                  EmacsFSWindow *win = [view window];
+                  if ([win isKindOfClass:[EmacsFSWindow class]]) {
+                      [[win getNormalWindow] orderOut:nil];
+                  }
+              }
             }
 
           if (view)
@@ -1275,8 +1281,15 @@ x_set_window_size (struct frame *f, int change_grav, int cols, int rows)
   f->scroll_bar_actual_width = NS_SCROLL_BAR_WIDTH (f);
   compute_fringe_widths (f, 0);
 
-  pixelwidth =  FRAME_TEXT_COLS_TO_PIXEL_WIDTH   (f, cols);
-  pixelheight = FRAME_TEXT_LINES_TO_PIXEL_HEIGHT (f, rows);
+  if ([window isKindOfClass:[EmacsFSWindow class]]) {
+      pixelwidth = [[window screen] frame].size.width;
+      pixelheight = [[window screen] frame].size.height;
+  }
+  else {
+      pixelwidth =  FRAME_TEXT_COLS_TO_PIXEL_WIDTH   (f, cols);
+      pixelheight = FRAME_TEXT_LINES_TO_PIXEL_HEIGHT (f, rows);
+  }
+ 
 
   /* If we have a toolbar, take its height into account. */
   if (tb)
@@ -5857,6 +5870,7 @@ not_in_argv (NSString *arg)
 
 - (void)windowWillEnterFullScreen:(NSNotification *)notification
 {
+    NSLog(@"Enter with lion API");
   fs_before_fs = fs_state;
 }
 
@@ -6413,6 +6427,59 @@ not_in_argv (NSString *arg)
 
 @implementation EmacsWindow
 
+-(NSWindow *)toggleFullscreen {
+    BOOL isFullscreen = [[self className] isEqualToString:@"EmacsFSWindow"];
+    NSWindow *win;
+    if (isFullscreen) {
+        EmacsFSWindow *f = (EmacsFSWindow *)self;
+        EmacsWindow *w = [f getNormalWindow];
+
+        [w setContentView:[f contentView]];
+        [w makeKeyAndOrderFront:nil];
+
+        [f close];
+
+        win = w;
+
+        if ([[self screen] isEqual:[[NSScreen screens] objectAtIndex:0]]) {
+            if ([NSApp respondsToSelector:@selector(setPresentationOptions:)]) {
+                [NSApp setPresentationOptions:NSApplicationPresentationDefault];
+            }
+            else {
+                [NSMenu setMenuBarVisible:YES];
+            }
+        }
+    }
+    else {
+        [self deminiaturize:nil];
+
+        if ([[self screen] isEqual:[[NSScreen screens] objectAtIndex:0]]) {
+            if ([NSApp respondsToSelector:@selector(setPresentationOptions:)]) {
+                [NSApp setPresentationOptions:NSApplicationPresentationAutoHideDock | NSApplicationPresentationAutoHideMenuBar];
+            }
+            else {
+                [NSMenu setMenuBarVisible:NO];
+            }
+        }
+
+        [self orderOut:nil];
+
+        EmacsFSWindow *f = [[EmacsFSWindow alloc] initWithNormalWindow:self];
+        EmacsView *view = (EmacsView *)[self delegate];
+        [f setDelegate:view];
+        [f makeFirstResponder:view];
+        [f setContentView:[self contentView]];
+        [f setContentSize:[[self screen] frame].size];
+        [f setTitle:[self title]];
+        [f makeKeyAndOrderFront:nil];
+
+        win = f;
+    }
+
+    return win;
+}
+
+
 #ifdef NS_IMPL_COCOA
 - (id)accessibilityAttributeValue:(NSString *)attribute
 {
@@ -6499,17 +6566,35 @@ not_in_argv (NSString *arg)
 
 @implementation EmacsFSWindow
 
-- (BOOL)canBecomeKeyWindow
+- (BOOL)canBecomeMainWindow
 {
   return YES;
 }
 
-- (BOOL)canBecomeMainWindow
-{
-  return YES;
+-(BOOL)canBecomeKeyWindow {
+    return YES;
 }
 
-@end
+-(id)initWithNormalWindow:(EmacsWindow *)window {
+    self = [super initWithContentRect:[window contentRectForFrameRect:[[window screen] frame]]
+                            styleMask:NSBorderlessWindowMask
+                              backing:NSBackingStoreBuffered
+                                defer:YES];
+    if (self) {
+        normalWindow = window;
+        [self setAcceptsMouseMovedEvents: YES];
+        [self useOptimizedDrawing: YES];
+    }
+
+    return self;
+}
+
+-(EmacsWindow *)getNormalWindow {
+    return normalWindow;
+}
+
+@end /* EmacsFullWindow */
+
 
 /* ==========================================================================