Tracking cleanup

- Collapse plane track panels by default
- Hide 3D markers when in mask edit mode
- Remove alpha from mask layers list

Discussed with Sebastian and Roman.

release/scripts/startup/bl_ui/space_clip.py

@@ -316,6 +316,7 @@ class CLIP_PT_tools_plane_tracking(CLIP_PT_tracking_panel, Panel):
     bl_space_type = 'CLIP_EDITOR'
     bl_region_type = 'TOOLS'
     bl_label = "Plane Track"
+    bl_options = {'DEFAULT_CLOSED'}
 
     def draw(self, context):
         layout = self.layout
@@ -594,6 +595,7 @@ class CLIP_PT_plane_track(CLIP_PT_tracking_panel, Panel):
     bl_space_type = 'CLIP_EDITOR'
     bl_region_type = 'UI'
     bl_label = "Plane Track"
+    bl_options = {'DEFAULT_CLOSED'}
 
     def draw(self, context):
         layout = self.layout
@@ -718,7 +720,8 @@ class CLIP_PT_display(CLIP_PT_clip_view_panel, Panel):
 
         col.prop(sc, "show_disabled", "Disabled Tracks")
         col.prop(sc, "show_names", text="Names and Status")
-        col.prop(sc, "show_bundles", text="3D Markers")
+        if sc.mode != 'MASK':
+            col.prop(sc, "show_bundles", text="3D Markers")
 
         col.prop(sc, "use_mute_footage", text="Mute Footage")
         col.prop(sc, "lock_selection")