[gtk+] window: maximize on double click only if allowed

[Matthias Clasen <matthiasc src gnome org>]

commit 1080ffdf19fe49c803da0baa4047cce3c29815b6
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Wed Nov 4 11:24:36 2015 +0100

    window: maximize on double click only if allowed
    
    GtkHeaderBar will not show the maximize button if the window in not of
    type normal or not resizeable.
    
    Use the same restriction for double-click actions as well.
    
    Bugzilla: https://bugzilla.gnome.org/show_bug.cgi?id=757530

 gtk/gtkwindow.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 7b05341..f87acd9 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -1383,7 +1383,16 @@ gtk_window_titlebar_action (GtkWindow      *window,
     retval = FALSE;
     /* treat all maximization variants the same */
   else if (g_str_has_prefix (action, "toggle-maximize"))
-    _gtk_window_toggle_maximized (window);
+    {
+      /*
+       * gtk header bar won't show the maximize button if the following
+       * properties are not met, apply the same to title bar actions for
+       * consistency.
+       */
+      if (gtk_window_get_resizable (window) &&
+          gtk_window_get_type_hint (window) == GDK_WINDOW_TYPE_HINT_NORMAL)
+            _gtk_window_toggle_maximized (window);
+    }
   else if (g_str_equal (action, "lower"))
     gdk_window_lower (_gtk_widget_get_window (GTK_WIDGET (window)));
   else if (g_str_equal (action, "minimize"))