(delete-selection-mode): Convert to autoloaded option. Default to nil.
(delete-selection-mode): Define before option.
Modify pre-command-hook here, i.e., not at the top-level.
(delete-selection-mode): Convert to autoloaded option. Default to nil.
(delete-selection-mode): Define before option.
Modify pre-command-hook here, i.e., not at the top-level.