aria-hidden and tabindex in default.blade.php

[mauro-miatello]

editing resources/views/layouts/default.blade.php I've noticed that there are some incongruous commands:

1. lines 152 and following: some aria-hidden have also tabindex, some not
2. the first occurence of "i class" has aria-hidden, others haven't
   what is the right sequence to use? Can I copy from line 215 "dropdown-menu" and following?

[mauro-miatello]

#14250