Expose lower-API to modify text and selection, and to query selection #69
Description
Editor component could have public functions like:
// like HTMLTextareaElement
selectionStart: number
selectionEnd: number
setSelectionRange(start, end)
setValue(text) // raw text; should apply highlighting, preserve selection and amend history
API to selection could be needed to enable button behaviour depending on where the selection is (e. g. to implement "comment out" button if there's no comment on current line).
API to modify value can be useful for example, to implement "comment out" button mentioned above.