Fix FPS menu in "Format" panel not following translation setting

The FPS menu was using a cached value which wasn't being refreshed
when translation changed.

Add `bpy.app.handlers.translation_update_post` handler which runs
when translation changes, this can be used to clear any cached UI
values.

Ref !117049

scripts/startup/bl_ui/__init__.py

@@ -104,6 +104,13 @@ _modules_loaded = [_namespace[name] for name in _modules]
 del _namespace
 
 
+# Bypass the caching mechanism in the "Format" panel to make sure it is properly translated on language update.
+@bpy.app.handlers.persistent
+def translation_update(_):
+    from .properties_output import RENDER_PT_format
+    RENDER_PT_format._frame_rate_args_prev = None
+
+
 def register():
     from bpy.utils import register_class
     for mod in _modules_loaded:
@@ -166,6 +173,8 @@ def register():
     )
     del items
 
+    bpy.app.handlers.translation_update_post.append(translation_update)
+
     # done...
 
 
@@ -176,6 +185,11 @@ def unregister():
             if cls.is_registered:
                 unregister_class(cls)
 
+    try:
+        bpy.app.handlers.translation_update_post.remove(translation_update)
+    except ValueError:
+        pass
+
 # Define a default UIList, when a list does not need any custom drawing...
 # Keep in sync with its #defined name in UI_interface.hh
 

source/blender/blenkernel/BKE_callbacks.h

@@ -109,6 +109,7 @@ typedef enum {
   BKE_CB_EVT_COMPOSITE_CANCEL,
   BKE_CB_EVT_ANIMATION_PLAYBACK_PRE,
   BKE_CB_EVT_ANIMATION_PLAYBACK_POST,
+  BKE_CB_EVT_TRANSLATION_UPDATE_POST,
   BKE_CB_EVT_EXTENSION_REPOS_UPDATE_PRE,
   BKE_CB_EVT_EXTENSION_REPOS_UPDATE_POST,
   BKE_CB_EVT_TOT,

source/blender/makesrna/intern/rna_userdef.cc

@@ -324,7 +324,7 @@ static void rna_userdef_font_update(Main * /*bmain*/, Scene * /*scene*/, Pointer
   UI_reinit_font();
 }
 
-static void rna_userdef_language_update(Main * /*bmain*/, Scene * /*scene*/, PointerRNA * /*ptr*/)
+static void rna_userdef_language_update(Main *bmain, Scene * /*scene*/, PointerRNA * /*ptr*/)
 {
   BLT_lang_set(nullptr);
 
@@ -336,6 +336,14 @@ static void rna_userdef_language_update(Main * /*bmain*/, Scene * /*scene*/, Poi
     U.transopts |= (USER_TR_IFACE | USER_TR_TOOLTIPS | USER_TR_REPORTS | USER_TR_NEWDATANAME);
   }
 
+  BKE_callback_exec_null(bmain, BKE_CB_EVT_TRANSLATION_UPDATE_POST);
+  USERDEF_TAG_DIRTY;
+}
+
+static void rna_userdef_translation_update(Main *bmain, Scene * /*scene*/, PointerRNA * /*ptr*/)
+{
+  BKE_callback_exec_null(bmain, BKE_CB_EVT_TRANSLATION_UPDATE_POST);
+  WM_main_add_notifier(NC_WINDOW, nullptr);
   USERDEF_TAG_DIRTY;
 }
 
@@ -5226,7 +5234,7 @@ static void rna_def_userdef_view(BlenderRNA *brna)
   RNA_def_property_ui_text(prop,
                            "Translate Tooltips",
                            "Translate the descriptions when hovering UI elements (recommended)");
-  RNA_def_property_update(prop, 0, "rna_userdef_update");
+  RNA_def_property_update(prop, 0, "rna_userdef_translation_update");
 
   prop = RNA_def_property(srna, "use_translate_interface", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, nullptr, "transopts", USER_TR_IFACE);
@@ -5235,20 +5243,20 @@ static void rna_def_userdef_view(BlenderRNA *brna)
       "Translate Interface",
       "Translate all labels in menus, buttons and panels "
       "(note that this might make it hard to follow tutorials or the manual)");
-  RNA_def_property_update(prop, 0, "rna_userdef_update");
+  RNA_def_property_update(prop, 0, "rna_userdef_translation_update");
 
   prop = RNA_def_property(srna, "use_translate_reports", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, nullptr, "transopts", USER_TR_REPORTS);
   RNA_def_property_ui_text(
       prop, "Translate Reports", "Translate additional information, such as error messages");
-  RNA_def_property_update(prop, 0, "rna_userdef_update");
+  RNA_def_property_update(prop, 0, "rna_userdef_translation_update");
 
   prop = RNA_def_property(srna, "use_translate_new_dataname", PROP_BOOLEAN, PROP_NONE);
   RNA_def_property_boolean_sdna(prop, nullptr, "transopts", USER_TR_NEWDATANAME);
   RNA_def_property_ui_text(prop,
                            "Translate New Names",
                            "Translate the names of new data-blocks (objects, materials...)");
-  RNA_def_property_update(prop, 0, "rna_userdef_update");
+  RNA_def_property_update(prop, 0, "rna_userdef_translation_update");
 
   /* Status-bar. */
 

source/blender/python/intern/bpy_app_handlers.cc

@@ -90,6 +90,7 @@ static PyStructSequence_Field app_cb_info_fields[] = {
     {"composite_cancel", "on a compositing background job (cancel)"},
     {"animation_playback_pre", "on starting animation playback"},
     {"animation_playback_post", "on ending animation playback"},
+    {"translation_update_post", "on translation settings update"},
     /* NOTE(@ideasman42): This avoids bad-level calls into BPY API
      * but should not be considered part of the public Python API.
      * If there is a compelling reason to make these public, the leading `_` can be removed. */