Multi-line indent not working

### Expected
When I select multiple lines and press tab I expect all the selected lines to indent (this is what the SimpleNote Web App does)

### Observed
Only the first line is indented.

### Reproduced
1. Open a note
2. Add multiple lines of text
3. Select multiple lines
4. Press the tab key on the keyboard

Start by reproducing the behavior in the macOS note editor using the four steps in the issue, then inspect the editor's handling of a multi-line selection when Tab is pressed. Done means pressing Tab indents every selected line rather than only the first one; verify that behavior with a multi-line note.

Written by the indexing model from the issue text.