actions: hide windows-display-* actions from the Shortcuts dialog

windows‑display* actions are used to switch open displays and are not
meant to be remapped. They are implemented so they can be reassigned
each time a display is opened, closed, or moved, in order to keep them
aligned with the order of displays. This commit hides them from the
Shortcuts dialog to prevent remapping and avoidinconsistent behavior.
To avoid hiding these actions completely and making them harder to discover,
this commit removes them only from the shortcuts dialog while still showing
them in the action search.
(see #11685)

app/widgets/gimpaction-history.c

@@ -318,7 +318,7 @@ gimp_action_history_search (Gimp                *gimp,
 gboolean
 gimp_action_history_is_blacklisted_action (const gchar *action_name)
 {
-  if (gimp_action_is_gui_blacklisted (action_name))
+  if (gimp_action_is_action_search_blacklisted (action_name))
     return TRUE;
 
   return (g_str_has_suffix (action_name, "-set")            ||

app/widgets/gimpaction.c

@@ -758,6 +758,29 @@ gimp_action_name_compare (GimpAction  *action1,
 
 gboolean
 gimp_action_is_gui_blacklisted (const gchar *action_name)
+{
+  static const gchar *prefixes[] =
+    {
+      "windows-display-"
+    };
+
+  if (! (action_name && *action_name))
+    return TRUE;
+
+  for (guint i = 0; i < G_N_ELEMENTS (prefixes); i++)
+    {
+      if (g_str_has_prefix (action_name, prefixes[i]))
+        return TRUE;
+    }
+
+  if (gimp_action_is_action_search_blacklisted (action_name))
+    return TRUE;
+
+  return FALSE;
+}
+
+gboolean
+gimp_action_is_action_search_blacklisted (const gchar *action_name)
 {
   static const gchar *prefixes[] =
     {

app/widgets/gimpaction.h

@@ -126,6 +126,8 @@ gint              gimp_action_name_compare        (GimpAction      *action1,
                                                    GimpAction      *action2);
 
 gboolean          gimp_action_is_gui_blacklisted  (const gchar     *action_name);
+gboolean          gimp_action_is_action_search_blacklisted
+                                                  (const gchar     *action_name);
 
 GimpContext     * gimp_action_get_context         (GimpAction      *action);
 GimpViewable    * gimp_action_get_viewable        (GimpAction      *action);