Sometimes you may inadvertently edit an invisible part of the buffer
and be confused on what has been edited and how to undo the mistake.
By default, Org prevents such edits for a limited set of user
commands. Users can control which commands are affected by
customizing org-fold-catch-invisible-edits-commands.
The strategy used to decide if a given edit is dangerous is controlled
by org-fold-catch-invisible-edits. See the docstring of this option
on the available strategies. Set the option to nil to disable
catching invisible edits completely.