gtk: clean up title renaming and fix a small leak

src/apprt/gtk/class/tab.zig

@@ -330,6 +330,10 @@ pub const Tab = extern struct {
             glib.free(@ptrCast(@constCast(v)));
             priv.title = null;
         }
+        if (priv.title_override) |v| {
+            glib.free(@ptrCast(@constCast(v)));
+            priv.title_override = null;
+        }
 
         gobject.Object.virtual_methods.finalize.call(
             Class.parent,

src/apprt/gtk/class/window.zig

@@ -339,6 +339,7 @@ pub const Window = extern struct {
             .init("close-tab", actionCloseTab, s_variant_type),
             .init("new-tab", actionNewTab, null),
             .init("new-window", actionNewWindow, null),
+            .init("prompt-surface-title", actionPromptSurfaceTitle, null),
             .init("prompt-tab-title", actionPromptTabTitle, null),
             .init("prompt-context-tab-title", actionPromptContextTabTitle, null),
             .init("ring-bell", actionRingBell, null),
@@ -1803,6 +1804,14 @@ pub const Window = extern struct {
         tab.promptTabTitle();
     }
 
+    fn actionPromptSurfaceTitle(
+        _: *gio.SimpleAction,
+        _: ?*glib.Variant,
+        self: *Window,
+    ) callconv(.c) void {
+        self.performBindingAction(.prompt_surface_title);
+    }
+
     fn actionPromptTabTitle(
         _: *gio.SimpleAction,
         _: ?*glib.Variant,

src/apprt/gtk/ui/1.5/window.blp

@@ -243,7 +243,7 @@ menu main_menu {
 
       item {
         label: _("Change Title…");
-        action: "win.prompt-title";
+        action: "win.prompt-surface-title";
       }
 
       item {