From 9628ef413518e5ddda9c1c8106ce4fecbd1ae7c1 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Thu, 30 Sep 2021 12:51:09 +0200
Subject: Fix: wrong field input deduplication with Material Selection node

---
 .../blender/nodes/geometry/nodes/node_geo_material_selection.cc  | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/source/blender/nodes/geometry/nodes/node_geo_material_selection.cc b/source/blender/nodes/geometry/nodes/node_geo_material_selection.cc
index 337bd88c6e6..9d4533b9bda 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_material_selection.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_material_selection.cc
@@ -100,13 +100,16 @@ class MaterialSelectionFieldInput final : public fn::FieldInput {
 
   uint64_t hash() const override
   {
-    /* Some random constant hash. */
-    return 91619626;
+    return get_default_hash(material_);
   }
 
   bool is_equal_to(const fn::FieldNode &other) const override
   {
-    return dynamic_cast<const MaterialSelectionFieldInput *>(&other) != nullptr;
+    if (const MaterialSelectionFieldInput *other_material_selection =
+            dynamic_cast<const MaterialSelectionFieldInput *>(&other)) {
+      return material_ == other_material_selection->material_;
+    }
+    return false;
   }
 };
 
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