Hello geanist,
When I delete the end of a (python) code document, and this part contained a block, the folding margins shows phantom traces of the dead block. Depending on how it was deleted, it can be a foldable sign (minus) of the sign that marks the end of a foldable block (like a comma). Running then sometimes raises syntax error -- which probably means there is an invisible character in buffer. To exorcise that spook, I just need to write anything on the line where the sign appears.
Denis
------ la vida e estranya