fix(autocomplete): don't open panel for readonly inputs, even with keyboard

[gogakoreli]

Bug, feature request, or proposal:

When I disable input inside autocomplete I can still open the panel when input has focus and I click the arrow buttons on my keyboard.
#7271 this pull request only fixed this issue for input focus, panel doesn't open if I click on the input with the mouse or change focus with tab, but still opens with arrow keys.

What is the expected behavior?

Autocomplete panel shouldn't open when input is readonly, even with the keyboard

What is the current behavior?

Autocomplete panel opens when input is readonly using keyboard arrows

What are the steps to reproduce?

Autocomplete Stackblitz, in this example add readonly to the input inside autocomplete, then focus the input with mouse click and click on the keyboard down arrow key ( ↓ ).

[julianobrasil]

Your stackblitz is using Material 5.0.0-rc3.

If you update it to Material 5.0.3, you'll noticed it doesn't happens anymore (the panel does not open neither for disabled nor for readonly inputs). It was fixed in PR #7271.

[EDIT]: sorry, I misread your issue. It is not covered by #7271

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