Commits on Apr 13, 2023

1. fix(material/core): remove tabindex from mat-option …

   Remove the tabindex attribute added to MatOption components. MatOption
   does not need tabindex because the parent component manages focus by
   setting `aria-activedescendant` attribute. Previously, MatOption set
   tabindex but was also a referenced by aria-activedescendant. This was
   not the correct ARIA semantics. Align closer to ARIA spec by using only
   aria-activedescendant rather than both.
   
   Tabindex="-1" seems to be causing a problem in angular#26861 where VoiceOver
   with Firefox moves DOM focus from the combobox to the option when
   opening the listbox popup.
   
   Unblocks angular#26861.

   

   zarend committed Apr 13, 2023
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