From 1a4680654688fd542e77c4f339d2b5eb98ae17c9 Mon Sep 17 00:00:00 2001
From: Falk David <falk@blender.org>
Date: Thu, 17 Jul 2025 11:13:57 +0200
Subject: [PATCH] Fix: Grease Pencil: Missing call to `finish()` writing layer
 attributes

The `GSpanAttributeWriter` was missing a call to `finish()` to ensure
the changes are tagged and saved.
---
 source/blender/blenkernel/intern/grease_pencil.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/source/blender/blenkernel/intern/grease_pencil.cc b/source/blender/blenkernel/intern/grease_pencil.cc
index 7bf1ff01432..7a7f3c6be2a 100644
--- a/source/blender/blenkernel/intern/grease_pencil.cc
+++ b/source/blender/blenkernel/intern/grease_pencil.cc
@@ -3789,6 +3789,7 @@ blender::bke::greasepencil::Layer &GreasePencil::duplicate_layer(
     bke::GSpanAttributeWriter attr = attributes.lookup_for_write_span(iter.name);
     GMutableSpan span = attr.span;
     span.type().copy_assign(span[*duplicate_layer_idx], span[numLayers]);
+    attr.finish();
   });
 
   this->update_drawing_users_for_layer(*new_layer);