optional
highlightName: string
Highlight name for unprintable chars.
Default is "ddc_unprintable".
optional
highlightGroup: string
Highlight group for unprintable chars.
Default is "SpecialKey".
optional
placeholder: string
Placeholder text for unprintable char.
Must be a single character. Default is "?".
Max width of the abbreviates column.
If 0 is specified, be unlimited. Default is 0.
optional
callbackId: string
Callback Id base string.
If empty, use random id.