From 9820f273c2e1ca9df0d761b46fce3804f73001f3 Mon Sep 17 00:00:00 2001
From: pullusb <bernou.samuel@gmail.com>
Date: Thu, 22 Feb 2024 11:56:18 +0100
Subject: [PATCH] fix preview output in blender 4

1.6.1

- fixed: preview output for Blender 4.0+
---
 CHANGELOG.md |  4 ++++
 __init__.py  |  2 +-
 fn.py        | 10 ++++++++--
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9f4d1b9..170dca4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ Activate / deactivate layer opacity according to prefix
 Activate / deactivate all masks using MA layers
 -->
 
+1.6.1
+
+- fixed: preview output for Blender 4.0+
+
 1.6.0
 
 - added: Connect selection to new or existing fileout
diff --git a/__init__.py b/__init__.py
index 03cc72a..5711654 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,7 +2,7 @@ bl_info = {
     "name": "GP Render",
     "description": "Organise export of gp layers through compositor output",
     "author": "Samuel Bernou",
-    "version": (1, 6, 0),
+    "version": (1, 6, 1),
     "blender": (3, 0, 0),
     "location": "View3D",
     "warning": "",
diff --git a/fn.py b/fn.py
index 8bb602f..9131848 100644
--- a/fn.py
+++ b/fn.py
@@ -864,8 +864,14 @@ def nodegroup_merge_inputs(ngroup, aa=True):
         y += offset_y
         prev = ao
 
-    # create one input and link
-    out = ngroup.outputs.new('NodeSocketColor', ngroup.inputs[0].name)
+    # Create one output and link
+    out_name = 'preview'
+    if bpy.app.version < (4,0,0):
+        # out_name = ngroup.inputs[0].name # name like first inputout_name
+        out = ngroup.outputs.new('NodeSocketColor', out_name)
+    else:
+        # out_name = next((s for s in ngroup.interface.items_tree if s.in_out == 'INPUT')).name # name like first input
+        out = ngroup.interface.new_socket(out_name, in_out='OUTPUT', socket_type='NodeSocketColor')
     
     ## create a merged name as output ??
     if aa: