Don't crash when popups are created on session lock surfaces

examples/session-lock.c

@@ -71,6 +71,9 @@ static void activate(GtkApplication* app, void *data) {
         g_signal_connect(button, "clicked", G_CALLBACK(unlock), app);
         gtk_box_append(GTK_BOX(box), button);
 
+        // Not displayed, but allows testing that creating popups doesn't crash GTK
+        gtk_widget_set_tooltip_text(button, "Foo Bar Baz");
+
         gtk_window_set_child(GTK_WINDOW(gtk_window), box);
         gtk_window_present(gtk_window);
     }

src/gtk4-session-lock.c

@@ -1,4 +1,5 @@
 #include "gtk4-session-lock.h"
+#include "session-lock.h"
 #include "lock-surface.h"
 #include "registry.h"
 #include "libwayland-shim.h"
@@ -20,6 +21,7 @@ gboolean gtk_session_lock_is_supported() {
 
 struct _GtkSessionLockInstance {
     GObject parent_instance;
+    void* wayland_object;
     gboolean is_locked;
     gboolean has_requested_lock;
     gboolean failed;
@@ -111,6 +113,7 @@ gboolean gtk_session_lock_instance_lock(GtkSessionLockInstance* self) {
 
     self->has_requested_lock = TRUE;
     session_lock_lock(wl_display, session_lock_locked_callback_impl, self);
+    self->wayland_object = self->failed ? NULL : (void*)session_lock_get_active_lock();
     return !self->failed;
 }
 
@@ -160,7 +163,11 @@ static struct lock_surface_t* lock_surface_hook_callback_impl(struct wl_surface*
 static void on_window_mapped(GtkWindow *window, gpointer data) {
     (void)window;
     struct gtk_lock_surface_t* self = data;
-    lock_surface_map(&self->super, self->lock);
+    if (self->lock->wayland_object == session_lock_get_active_lock()) {
+        lock_surface_map(&self->super);
+    } else {
+        g_warning("Not showing lock surface because the session lock it is linked to is not active");
+    }
 }
 
 void gtk_session_lock_instance_assign_window_to_monitor(

src/libwayland-shim.c

@@ -128,6 +128,10 @@ struct wl_display* libwayland_shim_proxy_get_display(struct wl_proxy* proxy) {
     return proxy->display;
 }
 
+struct wl_event_queue* libwayland_shim_proxy_get_queue(struct wl_proxy* proxy) {
+    return proxy->queue;
+}
+
 // Returns true if any arguments are proxies created by us(not known to libwayland)
 static bool args_contains_client_facing_proxy(
     struct wl_proxy* proxy,

src/libwayland-shim.h

@@ -60,6 +60,8 @@ void* libwayland_shim_get_client_proxy_data(struct wl_proxy* proxy, void* expect
 // Yes wl_proxy_get_display exists, but only in libwayland >=1.23. This can be replaced with that once we can drop
 // support for older libwaylands (though no rush, this works)
 struct wl_display* libwayland_shim_proxy_get_display(struct wl_proxy* proxy);
+// Same deal, wl_proxy_get_queue() exists but is new
+struct wl_event_queue* libwayland_shim_proxy_get_queue(struct wl_proxy* proxy);
 
 #define LIBWAYLAND_SHIM_FIRST_ARG(first, ...) first
 #define LIBWAYLAND_SHIM_DISPATCH_CLIENT_EVENT(listener, event, ...) \