Select all also select the disabled options

[Gabriellpa]

Hi
The select all button is also selecting the disabled options, i dont think is planned to work like this since the option is disabled.

I forked the demo example and added to option One and Two the 'disabled:true'.
When click in the 'select all' i'd like to mark all options excpect the disabled options.

link: https://stackblitz.com/edit/mat-select-autocomplete-sa7iuv?file=src/app/app.component.ts

thanks for the attetion.