From a15aaa3aa63fae047fb842a00d488db0e683dfd0 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Tue, 28 Jan 2025 16:51:17 +0100
Subject: [PATCH] Fix #133603: reroute node breaks graying out node group
 inputs

The evaluated value was not properly forwarded through reroute nodes.
---
 .../nodes/intern/socket_usage_inference.cc        | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/source/blender/nodes/intern/socket_usage_inference.cc b/source/blender/nodes/intern/socket_usage_inference.cc
index 10bac6b5dda..410a5054a94 100644
--- a/source/blender/nodes/intern/socket_usage_inference.cc
+++ b/source/blender/nodes/intern/socket_usage_inference.cc
@@ -492,6 +492,10 @@ struct SocketUsageInferencer {
         this->value_task__output__group_input_node(socket);
         return;
       }
+      case NODE_REROUTE: {
+        this->value_task__output__reroute_node(socket);
+        return;
+      }
       case GEO_NODE_SWITCH: {
         this->value_task__output__generic_switch(socket, switch__is_socket_selected);
         return;
@@ -565,6 +569,17 @@ struct SocketUsageInferencer {
     all_socket_values_.add_new(socket, *value);
   }
 
+  void value_task__output__reroute_node(const SocketInContext &socket)
+  {
+    const SocketInContext input_socket = socket.owner_node().input_socket(0);
+    const std::optional<const void *> value = all_socket_values_.lookup_try(input_socket);
+    if (!value.has_value()) {
+      this->push_value_task(input_socket);
+      return;
+    }
+    all_socket_values_.add_new(socket, *value);
+  }
+
   /**
    * Assumes that the first input is a condition that selects one of the remaining inputs which is
    * then output. If necessary, this can trigger a value task for the condition socket.