Fix puzzle window resize behaviour on Unity.

Unity hijacks the menu bar and prevents it from appearing in the main
puzzle window. And we wait for the menu bar to appear before reducing
the puzzle drawing area's size request. These two behaviours go
together badly.

Fixed by detecting the extra GTK property that the Unity patches
invented, and using that to know whether to expect the menu bar to
show up at all.

1 files changed, 29 insertions, 1 deletions

diff --git a/gtk.c b/gtk.c
index 01b5ee4..3e8df06 100644
--- a/gtk.c
+++ b/gtk.c
@@ -157,6 +157,7 @@ struct frontend {
     int preset_threaded;
     GtkWidget *preset_custom;
     GtkWidget *copy_menu_item;
+    int menubar_is_local;
 };
 
 struct blitter {
@@ -1690,7 +1691,7 @@ static gboolean not_size_allocated_yet(GtkWidget *w)
 static void try_shrink_drawing_area(frontend *fe)
 {
     if (fe->drawing_area_shrink_pending &&
-        !not_size_allocated_yet(fe->menubar) &&
+        (!fe->menubar_is_local || !not_size_allocated_yet(fe->menubar)) &&
         !not_size_allocated_yet(fe->statusbar)) {
         /*
          * In order to permit the user to resize the window smaller as
@@ -2173,6 +2174,33 @@ static frontend *new_window(char *arg, int argtype, char **error)
 	midend_new_game(fe->me);
     }
 
+    {
+        /*
+         * try_shrink_drawing_area() will do some fiddling with the
+         * window size request (see comment in that function) after
+         * all the bits and pieces such as the menu bar and status bar
+         * have appeared in the puzzle window.
+         *
+         * However, on Unity systems, the menu bar _doesn't_ appear in
+         * the puzzle window, because the Unity shell hijacks it into
+         * the menu bar at the very top of the screen. We therefore
+         * try to detect that situation here, so that we don't sit
+         * here forever waiting for a menu bar.
+         */
+        const char prop[] = "gtk-shell-shows-menubar";
+        GtkSettings *settings = gtk_settings_get_default();
+        if (!g_object_class_find_property(G_OBJECT_GET_CLASS(settings),
+                                          prop)) {
+            fe->menubar_is_local = TRUE;
+        } else {
+            int unity_mode;
+            g_object_get(gtk_settings_get_default(),
+                         prop, &unity_mode,
+                         (const gchar *)NULL);
+            fe->menubar_is_local = !unity_mode;
+        }
+    }
+
     fe->window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
     gtk_window_set_title(GTK_WINDOW(fe->window), thegame.name);