[epiphany] Again disallow new tab action in app mode

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 753f4fd63358c7cbc0cc26cf63b9c415a68bf6cd
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Thu Apr 5 11:52:24 2018 -0500

    Again disallow new tab action in app mode
    
    Tabs still work, but only when opening a link
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795007

 src/ephy-notebook.c |    7 +++++--
 src/ephy-window.c   |    1 +
 2 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/src/ephy-notebook.c b/src/ephy-notebook.c
index 3833862..4a05b93 100644
--- a/src/ephy-notebook.c
+++ b/src/ephy-notebook.c
@@ -344,10 +344,12 @@ static void
 update_tabs_visibility (EphyNotebook *nb,
                         gboolean      before_inserting)
 {
+  EphyEmbedShellMode mode;
   gboolean show_tabs = FALSE;
   guint num;
   EphyPrefsUITabsBarVisibilityPolicy policy;
 
+  mode = ephy_embed_shell_get_mode (EPHY_EMBED_SHELL (ephy_shell_get_default ()));
   num = gtk_notebook_get_n_pages (GTK_NOTEBOOK (nb));
 
   if (before_inserting)
@@ -356,8 +358,9 @@ update_tabs_visibility (EphyNotebook *nb,
   policy = g_settings_get_enum (EPHY_SETTINGS_UI,
                                 EPHY_PREFS_UI_TABS_BAR_VISIBILITY_POLICY);
 
-  if (((policy == EPHY_PREFS_UI_TABS_BAR_VISIBILITY_POLICY_MORE_THAN_ONE && num > 1) ||
-       policy == EPHY_PREFS_UI_TABS_BAR_VISIBILITY_POLICY_ALWAYS))
+  if (mode != EPHY_EMBED_SHELL_MODE_APPLICATION &&
+      ((policy == EPHY_PREFS_UI_TABS_BAR_VISIBILITY_POLICY_MORE_THAN_ONE && num > 1) ||
+        policy == EPHY_PREFS_UI_TABS_BAR_VISIBILITY_POLICY_ALWAYS))
     show_tabs = TRUE;
 
   /* Only show the tabs when the "tabs-allowed" property is TRUE. */
diff --git a/src/ephy-window.c b/src/ephy-window.c
index e7aa10f..2bdf442 100644
--- a/src/ephy-window.c
+++ b/src/ephy-window.c
@@ -2997,6 +2997,7 @@ static const char *disabled_actions_for_app_mode[] = { "open",
                                                        "save-as-application",
                                                        "encoding",
                                                        "bookmark-page",
+                                                       "new-tab",
                                                        "home" };
 
 static void