glTF exporter: Tweak for action filter in Collection Export

Waiting a proper solution for props declaration:

- Filter now happen even if the list is not displayed
- Avoid spaming console with error, display a label saying what to do

scripts/addons_core/io_scene_gltf2/__init__.py

@@ -5,7 +5,7 @@
 bl_info = {
     'name': 'glTF 2.0 format',
     'author': 'Julien Duroure, Scurest, Norbert Nopper, Urs Hanselmann, Moritz Becher, Benjamin Schmithüsen, Jim Eckerlein, and many external contributors',
-    "version": (4, 4, 34),
+    "version": (4, 4, 35),
     'blender': (4, 4, 0),
     'location': 'File > Import-Export',
     'description': 'Import-Export as glTF 2.0',
@@ -1099,6 +1099,15 @@ class ExportGLTF2_Base(ConvertGLTF2_Base):
         # All custom export settings are stored in this container.
         export_settings = {}
 
+        # Collection Export does not handle correctly props declaration for now
+        # So use this tweak to manage it, waiting for a better solution
+        is_file_browser = context.space_data.type == 'FILE_BROWSER'
+        if not is_file_browser:
+            if not hasattr(context.scene, "gltf_action_filter") and self.export_action_filter:
+                bpy.types.Scene.gltf_action_filter = bpy.props.CollectionProperty(type=GLTF2_filter_action)
+                bpy.types.Scene.gltf_action_filter_active = bpy.props.IntProperty()
+
+
         # Get log level from parameters
         # If not set, get it from Blender app debug value
         export_settings['gltf_loglevel'] = self.export_loglevel

scripts/addons_core/io_scene_gltf2/blender/com/gltf2_blender_ui.py

@@ -650,6 +650,13 @@ def export_panel_animation_action_filter(layout, operator):
 
         row = body.row()
 
+        # Collection Export does not handle correctly property declaration
+        # So use this tweak to avoid spaming the console, waiting for a better solution
+        is_file_browser = bpy.context.space_data.type == 'FILE_BROWSER'
+        if not is_file_browser and not hasattr(bpy.data.scenes[0], "gltf_action_filter"):
+            row.label(text="Please disable/enable 'action filter' to refresh the list")
+            return
+
         if len(bpy.data.actions) > 0:
             row.template_list(
                 "SCENE_UL_gltf2_filter_action",