[gnome-shell] Don't put non-Shell windows in Ctrl+Alt+Tab if they wouldn't be visible

[Simon McVittie <smcv src gnome org>]

commit 1eeeead78f6523071606fdcfa7c4c1c48264381f
Author: Simon McVittie <simon mcvittie collabora co uk>
Date:   Tue May 7 19:25:06 2013 +0100

    Don't put non-Shell windows in Ctrl+Alt+Tab if they wouldn't be visible
    
    Metacity's Ctrl+Alt+Tab would include X11 windows
    with hints like GDK_WINDOW_TYPE_HINT_DOCK and
    GDK_WINDOW_TYPE_HINT_DESKTOP (there are more conditions, but that's a
    good start). If we're in normal mode, those are visible and it's OK
    to display those in the Ctrl+Alt+Tab order, but if we're in the lock
    screen or the unlock dialog, they're not visible and it doesn't make
    sense to focus them.
    
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=699862
    Signed-off-by: Simon McVittie <simon mcvittie collabora co uk>
    Reviewed-by: Florian Müllner <fmuellner gnome org>

 js/ui/ctrlAltTab.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/ctrlAltTab.js b/js/ui/ctrlAltTab.js
index 6fbd24e..dbb1fe0 100644
--- a/js/ui/ctrlAltTab.js
+++ b/js/ui/ctrlAltTab.js
@@ -89,7 +89,7 @@ const CtrlAltTabManager = new Lang.Class({
         let items = this._items.filter(function (item) { return item.proxy.mapped; });
 
         // And add the windows metacity would show in its Ctrl-Alt-Tab list
-        if (!Main.overview.visible) {
+        if (Main.sessionMode.hasWindows && !Main.overview.visible) {
             let screen = global.screen;
             let display = screen.get_display();
             let windows = display.get_tab_list(Meta.TabList.DOCKS, screen, screen.get_active_workspace ());