Fixed issues with linked elements from linked blend files #4081

In #4081 reported the case when during redo (changing param in operator's popup) `Ifc.rebuild_element_maps` was relinking elements without discarding possible linked blender libraries. It end up accidentally linking some library's objects to the current Ifc file leading to errors.

Also fixed possible similar issue in couple other places.

src/blenderbim/blenderbim/bim/ifc.py

@@ -163,8 +163,12 @@ class IfcStore:
         if not IfcStore.get_file():
             return
         for obj in bpy.data.objects:
+            if obj.library:
+                continue
             IfcStore.relink_object(obj)
         for obj in bpy.data.materials:
+            if obj.library:
+                continue
             IfcStore.relink_object(obj)
 
     @staticmethod

src/blenderbim/blenderbim/bim/operator.py

@@ -670,6 +670,8 @@ class ReloadIfcFile(bpy.types.Operator, tool.Ifc.Operator):
         # STEP IDs may change, but we assume the GlobalID to be constant
         obj_map = {}
         for obj in bpy.data.objects:
+            if obj.library:
+                continue
             element = tool.Ifc.get_entity(obj)
             if element and hasattr(element, "GlobalId"):
                 obj_map[obj.name] = element.GlobalId
@@ -678,6 +680,8 @@ class ReloadIfcFile(bpy.types.Operator, tool.Ifc.Operator):
         tool.Ifc.set(new)
 
         for obj in bpy.data.objects:
+            if obj.library:
+                continue
             global_id = obj_map.get(obj.name)
             if global_id:
                 try:

src/blenderbim/blenderbim/tool/ifc.py

@@ -118,6 +118,9 @@ class Ifc(blenderbim.core.tool.Ifc):
             return
 
         for obj in bpy.data.objects:
+            if obj.library:
+                continue
+
             bpy.msgbus.clear_by_owner(obj)
 
             element = cls.get_entity(obj)
@@ -134,6 +137,9 @@ class Ifc(blenderbim.core.tool.Ifc):
             )
 
         for obj in bpy.data.materials:
+            if obj.library:
+                continue
+
             bpy.msgbus.clear_by_owner(obj)
 
             material = cls.get_entity(obj)