More informative exception and prevent non-deleted child instances

klayout_package/python/kqcircuits/util/layout_to_code.py

@@ -362,7 +362,7 @@ def extract_pcell_data_from_views():
 
     Returns: a tuple (views, instances) where
         views: a list of lists. Each element corresponds to a view in KLayout and it is a list of
-        ``(type, location, parameters)`` tuples. These tuples completely describe the type, position 
+        ``(type, location, parameters)`` tuples. These tuples completely describe the type, position
         and parameters of a single PCell in the "Top Cell" of this view.
         instances: flattened list of all instances of KQCircuits PCells found.
     """

klayout_package/python/scripts/macros/0system/0reload.lym

@@ -41,12 +41,14 @@ from kqcircuits.util.library_helper import load_libraries
 from kqcircuits.util.layout_to_code import extract_pcell_data_from_views, restore_pcells_to_views
 
 views, instances = extract_pcell_data_from_views()
-try:
-  load_libraries(flush=True)
-except:
-  raise RuntimeError("Failed to reload KQCircuits libraries, keeping current views.")
 for inst in instances:
   inst.delete()
+try:
+  load_libraries(flush=True)
+except Exception as e:
+  restore_pcells_to_views(views)
+  raise RuntimeError("Failed to reload KQCircuits libraries and redraw cells." +
+    f"\nThe following exception was raised: \n{type(e).__name__}: {e}")
 restore_pcells_to_views(views)
 </text>
 </klayout-macro>