fix loading and unloading linked IFCs with a relative path

src/blenderbim/blenderbim/bim/module/project/operator.py

@@ -850,7 +850,7 @@ class UnloadLink(bpy.types.Operator):
         for scene in bpy.data.scenes:
             if scene.library and scene.library.filepath == filepath:
                 bpy.data.scenes.remove(scene)
-        link = context.scene.BIMProjectProperties.links.get(filepath)
+        link = context.scene.BIMProjectProperties.links.get(self.filepath)
         link.is_loaded = False
         return {"FINISHED"}
 
@@ -866,7 +866,7 @@ class LoadLink(bpy.types.Operator):
         filepath = self.filepath
         if not os.path.isabs(filepath):
             filepath = os.path.abspath(os.path.join(bpy.path.abspath("//"), filepath))
-        with bpy.data.libraries.load(self.filepath, link=True) as (data_from, data_to):
+        with bpy.data.libraries.load(filepath, link=True) as (data_from, data_to):
             data_to.scenes = data_from.scenes
         for scene in bpy.data.scenes:
             if not scene.library or scene.library.filepath != filepath:
@@ -875,7 +875,7 @@ class LoadLink(bpy.types.Operator):
                 if "IfcProject" not in child.name:
                     continue
                 bpy.data.scenes[0].collection.children.link(child)
-        link = context.scene.BIMProjectProperties.links.get(filepath)
+        link = context.scene.BIMProjectProperties.links.get(self.filepath)
         link.is_loaded = True
         return {"FINISHED"}