* lisp/cus-start.el (all): Add ns-use-native-fullscreen.

* lisp/cus-start.el (all): Add ns-use-native-fullscreen.

* src/nsmenu.m (update_frame_tool_bar): Check for negative tool bar
height.

* src/nsterm.h (HAVE_NATIVE_FS): Define if OSX => 10.7.
(EmacsView): Add fs_is_native, fsIsNative, isFullscreen and
updateCollectionBehaviour.

* src/nsterm.m (NEW_STYLE_FS): Remove.
(ns_last_use_native_fullscreen): New variable.
(x_make_frame_visible): Replace NEW_STYLE_FS with isFullscreen.
(x_set_window_size): Do not take title bar and tool bar into account
if isFullscreen returns YES.
(ns_fullscreen_hook): Replace NEW_STYLE_FS with isFullscreen.
(check_native_fs): New function.
(ns_select, ns_read_socket): Call check_native_fs if HAVE_NATIVE_FS.
(ns_term_init): Remove NEW_STYLE_FS.
(updateFrameSize:, windowWillResize:toSize:): Only adjust for title bar
and tool bar if isFullscreen returns NO.
(windowDidResize:): Replace NEW_STYLE_FS with fsIsNative.
(initFrameFromEmacs:): Initialize fs_is_native.  Replace NEW_STYLE_FS
with HAVE_NATIVE_FS.
(window:willUseFullScreenPresentationOptions:): New method.
(windowDidEnterFullScreen:): Replace NEW_STYLE_FS with fsIsNative.
Hide toolbar if not enabled.
(windowDidExitFullScreen:): Call updateCollectionBehaviour.
Restore tool bar if enabled, hide it otherwise (Bug#13444).
(fsIsNative, isFullscreen, updateCollectionBehaviour): New methods.
(toggleFullScreen:): If fs_is_native, call toggleFullScreen on
window.  Do no set FRAME_EXTERNAL_TOOL_BAR (f) to 0.
Check FRAME_EXTERNAL_TOOL_BAR (f) before restoring
FRAME_TOOLBAR_HEIGHT (f).  Call updateFrameSize when going non-fs.
(syms_of_nsterm): Add ns-use-native-fullscreen.