When in multi-cursor mode (e.g. via Ctrl+d or Ctrl+Alt+up/down), typing works fine except seemingly when trying to add a newline. Pressing enter adds a newline only for the final cursor that was created (I'm guessing because it sees this as the "real" cursor, it's the same one highlighted red). Each of the cursors still exist after pressing enter, so continuing to type continues to insert text at all cursors (though of course pressing enter again still only inserts a newline at the last cursor location).