Attributes: Hide internal UI attributes and disallow procedural access

This commit hides "UI attributes" described in T97452 from the UI lists
in mesh, curve, and point cloud properties, and disallow accessing them
in geometry nodes.

Internal UI attributes like selection and hiding values should use the
attribute system for simplicity and performance, but we don't want to
expose those attributes in the attribute panel, which is meant for
regular user interaction. Procedural access may be misleading or cause
problems, as described in the design task above.

These attributes are added by two upcoming patches: D14934, D14685

Differential Revision: https://developer.blender.org/D15069

release/scripts/startup/bl_ui/properties_data_mesh.py

@@ -497,6 +497,16 @@ class MESH_UL_attributes(UIList):
         'CORNER': "Face Corner",
     }
 
+    def filter_items(self, context, data, property):
+        attributes = getattr(data, property)
+        flags = []
+        indices = [i for i in range(len(attributes))]
+
+        for index, item in enumerate(attributes):
+            flags.append(self.bitflag_filter_item if item.is_internal else 0)
+        
+        return flags, indices
+
     def draw_item(self, _context, layout, _data, attribute, _icon, _active_data, _active_propname, _index):
         data_type = attribute.bl_rna.properties['data_type'].enum_items[attribute.data_type]
 
@@ -576,7 +586,7 @@ class ColorAttributesListBase():
         'CORNER': "Face Corner",
     }
 
-    def filter_items(self, _context, data, property):
+    def filter_items(self, context, data, property):
         attrs = getattr(data, property)
         ret = []
         idxs = []
@@ -584,7 +594,8 @@ class ColorAttributesListBase():
         for idx, item in enumerate(attrs):
             skip = (
                 (item.domain not in {"POINT", "CORNER"}) or
-                (item.data_type not in {"FLOAT_COLOR", "BYTE_COLOR"})
+                (item.data_type not in {"FLOAT_COLOR", "BYTE_COLOR"}) or
+                (not item.is_internal)
             )
             ret.append(self.bitflag_filter_item if not skip else 0)
             idxs.append(idx)