work: restore shift+spacebar for media play/pause

maybe put in maya config? idk what funiman's preference is

scripts/addons/Animation_Layers/__init__.py

@@ -20,7 +20,7 @@
 bl_info = {
     "name": "Animation Layers",
     "author": "Tal Hershkovich",
-    "version" : (2, 4, 0),
+    "version" : (2, 4, 1),
     "blender" : (3, 2, 0),
     "location": "View3D - Properties - Animation Panel",
     "description": "Simplifying the NLA editor into an animation layers UI and workflow",
@@ -73,7 +73,10 @@ class AnimLayersSceneSettings(bpy.types.PropertyGroup):
 
 class AnimLayersSettings(bpy.types.PropertyGroup):
     turn_on: bpy.props.BoolProperty(name="Turn Animation Layers On", description="Turn on and start Animation Layers", default=False, options={'HIDDEN'}, update = anim_layers.turn_animlayers_on, override = {'LIBRARY_OVERRIDABLE'})
+    # Active row in obj.Anim_Layers. Post-migration, 1:1 with NLA-track index.
     layer_index: bpy.props.IntProperty(update = anim_layers.update_layer_index, options={'LIBRARY_EDITABLE'}, default = 0, override = {'LIBRARY_OVERRIDABLE'})
+    # Schema version. 0 = pre-hierarchical (legacy GROUP rows); 1 = hierarchical (parent_layer refs).
+    schema_version: bpy.props.IntProperty(name="Schema Version", default=0, options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
     linked: bpy.props.BoolProperty(name="Linked", description="Duplicate a layer with a linked action", default=False, options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
     
     #Bake settings
@@ -125,13 +128,31 @@ class AnimLayersItems(bpy.types.PropertyGroup):
 
     action_range: bpy.props.FloatVectorProperty(name='action range', description="used to check if layer needs to update frame range", override = {'LIBRARY_OVERRIDABLE'}, size = 2)
     custom_frame_range: bpy.props.BoolProperty(name="Custom Frame Range", description="Use a custom frame range per layer instead of the scene frame range", default=False, options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_frame_range)
-    
+
     frame_start: bpy.props.FloatProperty(name='Action Start Frame', description="First frame of the layer's action",min = 0, default=0, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_frame_start)
     frame_end: bpy.props.FloatProperty(name='Action End Frame', description="End frame of the layer's action", default=0, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_frame_end)
     speed: bpy.props.FloatProperty(name='Speed of the action', description="Speed of the action strip", default = 1, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_speed)
     offset: bpy.props.FloatProperty(name='Offset when the action starts', description="Offseting the whole layer animation", default = 0, precision = 2, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_offset)
     repeat: bpy.props.FloatProperty(name="Repeat", description="Repeat the action", min = 0.1, default = 1, options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'}, update = anim_layers.layer_repeat)
 
+    # Hierarchical layer fields. Every layer is NLA-backed; a layer is a
+    # "group" iff something else points to it via parent_layer.
+    expanded: bpy.props.BoolProperty(name="Expanded", description="Show this layer's children in the UI list", default=True, options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
+    parent_layer: bpy.props.StringProperty(name="Parent Layer", description="Name of this layer's parent (empty = root)", default="", options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
+    group_color: bpy.props.FloatVectorProperty(name="Group Color", subtype='COLOR', size=4, min=0.0, max=1.0, default=(0.3, 0.5, 0.8, 1.0), options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
+    # Dynamic-enum dropdown for picking parent_layer in the UI. The setter
+    # refuses cycles (self + descendants are excluded from the options).
+    assigned_group: bpy.props.EnumProperty(name='Parent', description='Set this layer\'s parent (None = root)',
+        items=anim_layers.layer_group_enum_items, get=anim_layers.layer_group_get, set=anim_layers.layer_group_set,
+        options={'HIDDEN'})
+    # Legacy field for pre-migration data. Read by migrate_object_to_hierarchical
+    # and ignored thereafter. Schema retained so old .blend files load cleanly.
+    type: bpy.props.EnumProperty(name="Item Type (legacy)", default='LAYER',
+        items=[('LAYER', 'Layer', 'NLA-backed layer'),
+               ('GROUP', 'Group', 'Legacy phantom group row')],
+        options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
+    parent_group: bpy.props.StringProperty(name="Parent Group (legacy)", description="Pre-migration field. Read once by the schema-v1 migration, then unused.", default="", options={'HIDDEN'}, override = {'LIBRARY_OVERRIDABLE'})
+
 
 class AnimLayersObjects(bpy.types.PropertyGroup):