fix preview output in blender 4

1.6.1

- fixed: preview output for Blender 4.0+

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

__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": "",

fn.py

@@ -864,8 +864,14 @@ def nodegroup_merge_inputs(ngroup, aa=True):
         y += offset_y
         prev = ao
 
-    # create one input and link
+    # Create one output and link
-    out = ngroup.outputs.new('NodeSocketColor', ngroup.inputs[0].name)
+    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: