Redmine

        // Use execCommand so the edit participates in the browser's undo

        // stack (setRangeText and value assignments are not undoable).

        this.input.setSelectionRange(lineStartPos, selectionStart)

        if (!document.execCommand('delete')) {

          this.input.setRangeText('', lineStartPos, selectionStart, 'start')

        }

      case 'insert': {

        // Let the native line break through (it creates an undo entry and

        // scrolls the caret into view), then append the list marker at the

        // caret. Replacing input.value here instead would discard the undo

        // history on every Enter and leave the caret off-screen in an

        // overflowing textarea.

        const text = result.text

        this.input.addEventListener('input', (e) => {

          if (e.inputType !== 'insertLineBreak') return

          if (!document.execCommand('insertText', false, text)) {

            const el = e.currentTarget

            const pos = el.selectionStart

            el.setRangeText(text, pos, pos, 'end')

          }

        }, { once: true })

      }