As recommended by the Vim help (`:h <nomodeline>`):
After applying the autocommands the modelines are
processed, so that their settings overrule the
settings from autocommands, like what happens when
editing a file. This is skipped when the <nomodeline>
argument is present. You probably want to use
<nomodeline> for events that are not used when loading
a buffer, such as |User|.
Fixes: https://github.com/SirVer/ultisnips/issues/542
3eabbe71a3