gtksearchentry: Add a "catchall" click gesture handler

This gesture is set on the whole widget surface, since there's
multiple input targets inside an entry (icons, the GtkText itself)
it makes sense to consider the full entry an area handling clicks.
Ensure these events don't propagate further up, and result in other
actions.

gtk/gtksearchentry.c

@@ -579,11 +579,21 @@ activate_cb (GtkText  *text,
   g_signal_emit (data, signals[ACTIVATE], 0);
 }
 
+static void
+catchall_click_press (GtkGestureClick *gesture,
+                      int              n_press,
+                      double           x,
+                      double           y,
+                      gpointer         user_data)
+{
+  gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
+}
+
 static void
 gtk_search_entry_init (GtkSearchEntry *entry)
 {
   GtkWidget *icon;
-  GtkGesture *press;
+  GtkGesture *press, *catchall;
 
   /* The search icon is purely presentational */
   icon = g_object_new (GTK_TYPE_IMAGE,
@@ -615,6 +625,12 @@ gtk_search_entry_init (GtkSearchEntry *entry)
   g_signal_connect (press, "released", G_CALLBACK (gtk_search_entry_icon_release), entry);
   gtk_widget_add_controller (entry->icon, GTK_EVENT_CONTROLLER (press));
 
+  catchall = gtk_gesture_click_new ();
+  g_signal_connect (catchall, "pressed",
+                    G_CALLBACK (catchall_click_press), entry);
+  gtk_widget_add_controller (GTK_WIDGET (entry),
+                             GTK_EVENT_CONTROLLER (catchall));
+
   gtk_widget_add_css_class (GTK_WIDGET (entry), I_("search"));
 }