From 4c75beeca2d712409130a4cd2665250478267041 Mon Sep 17 00:00:00 2001
From: Julien Frantz <frantzy@illum-mg.fr>
Date: Tue, 3 Dec 2024 19:02:17 +0100
Subject: [PATCH] LayerManager: Prevent unintended overwriting of unmodified
 USD layers.

---
 lib/mayaUsd/nodes/layerManager.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/mayaUsd/nodes/layerManager.cpp b/lib/mayaUsd/nodes/layerManager.cpp
index 35d418bc9..16964c4bd 100644
--- a/lib/mayaUsd/nodes/layerManager.cpp
+++ b/lib/mayaUsd/nodes/layerManager.cpp
@@ -1022,7 +1022,8 @@ BatchSaveResult LayerDatabase::saveUsdToUsdFiles()
                 const auto& allLayers = info.stage->GetUsedLayers(true);
                 for (auto layer : allLayers) {
                     if (TF_VERIFY(layer)) {
-                        if (layer != sessionLayer && layer->PermissionToSave()) {
+                        if (layer != sessionLayer && layer->PermissionToSave()
+                            && layer->IsDirty()) {
                             if (!MayaUsd::utils::saveLayerWithFormat(layer)) {
                                 MString errMsg;
                                 MString layerName(layer->GetDisplayName().c_str());