Segfault with layer list manipulation while iterating

[klayoutmatthias]

This code segfaults on typical layer lists:

lv = pya.LayoutView.current()
  
to_delete = []
for l in lv.each_layer():
  if l.source_layer % 2 == 0:
    to_delete.append(l)

for l in to_delete:
  l.delete()

Reason: deleting a layer will invalidate the following iterators. That's reasonable, but the program should not segfault. The solution is to reverse:

...
to_delete.reverse()
for l in to_delete:
  l.delete()

[klayoutmatthias]

Will be released soon with 0.26.1