D14823: Adds operator to duplicate the active color attribute layer

Fixes T97706

Adds operator to duplicate the active color attribute layer.
Adds `"Color Attribute Specials"` menu to color attribute ui to access the `"geometry.color_attribute_duplicate"` operator.
Internally adds a function that duplicates a referenced CustomDataLayer
- `BKE_id_attribute_duplicate` mostly copies the existing `BKE_id_attribute_new`
- but gets the type and domain from the referenced layer
- and copies the data from the old layer into the new layer

Reviewed By: Joseph Eagar & Hans Goudey & Julien Kaspar
Differential Revision: https://developer.blender.org/D14823
Ref D14823

1 files changed, 17 insertions, 1 deletions

diff --git a/release/scripts/startup/bl_ui/properties_data_mesh.py b/release/scripts/startup/bl_ui/properties_data_mesh.py
index 15d25f71419..764299e7ce3 100644
--- a/release/scripts/startup/bl_ui/properties_data_mesh.py
+++ b/release/scripts/startup/bl_ui/properties_data_mesh.py
@@ -64,6 +64,18 @@ class MESH_MT_shape_key_context_menu(Menu):
         layout.operator("object.shape_key_move", icon='TRIA_DOWN_BAR', text="Move to Bottom").type = 'BOTTOM'
 
 
+class MESH_MT_color_attribute_context_menu(Menu):
+    bl_label = "Color Attribute Specials"
+
+    def draw(self, _context):
+        layout = self.layout
+
+        props = layout.operator(
+            "geometry.color_attribute_duplicate",
+            icon='DUPLICATE',
+        )
+
+
 class MESH_MT_attribute_context_menu(Menu):
     bl_label = "Attribute Specials"
 
@@ -660,12 +672,16 @@ class DATA_PT_vertex_colors(DATA_PT_mesh_attributes, Panel):
         col.operator("geometry.color_attribute_add", icon='ADD', text="")
         col.operator("geometry.color_attribute_remove", icon='REMOVE', text="")
 
-        self.draw_attribute_warnings(context, layout)
+        col.separator()
 
+        col.menu("MESH_MT_color_attribute_context_menu", icon='DOWNARROW_HLT', text="")
+
+        self.draw_attribute_warnings(context, layout)
 
 classes = (
     MESH_MT_vertex_group_context_menu,
     MESH_MT_shape_key_context_menu,
+    MESH_MT_color_attribute_context_menu,
     MESH_MT_attribute_context_menu,
     MESH_UL_vgroups,
     MESH_UL_fmaps,