[core] Discard attribute callbacks during graph loading

meshroom/core/graph.py

@@ -215,6 +215,7 @@ def getFeaturesForVersion(fileVersion):
     def __init__(self, name, parent=None):
         super(Graph, self).__init__(parent)
         self.name = name
+        self._loading = False
         self._updateEnabled = True
         self._updateRequested = False
         self.dirtyTopology = False
@@ -247,6 +248,11 @@ def fileFeatures(self):
         """ Get loaded file supported features based on its version. """
         return Graph.IO.getFeaturesForVersion(self.header.get(Graph.IO.Keys.FileVersion, "0.0"))
 
+    @property
+    def isLoading(self):
+        """ Return True if the graph is currently being loaded. """
+        return self._loading
+
     @Slot(str)
     def load(self, filepath, setupProjectFile=True, importProject=False, publishOutputs=False):
         """
@@ -260,6 +266,13 @@ def load(self, filepath, setupProjectFile=True, importProject=False, publishOutp
                            of opened.
             publishOutputs: True if "Publish" nodes from templates should not be ignored.
         """
+        self._loading = True
+        try:
+            self._load(filepath, setupProjectFile, importProject, publishOutputs)
+        finally:
+            self._loading = False
+
+    def _load(self, filepath, setupProjectFile, importProject, publishOutputs):
         if not importProject:
             self.clear()
         with open(filepath) as jsonFile:

meshroom/core/node.py

@@ -964,6 +964,10 @@ def _onAttributeChanged(self, attr: Attribute):
         if attr.value is None:
             # Discard dynamic values depending on the graph processing.
             return
+
+        if self.graph and self.graph.isLoading:
+            # Do not trigger attribute callbacks during the graph loading.
+            return
 
         callback = self._getAttributeChangedCallback(attr)