[Combobox] Clear value when input focused after interacting with popover

[indiesquidge]

Summary

Before

Typing in the input, tabbing to an interactive element in the listbox, focusing the input again, then attempting to delete the entire input value with ⌘ + ⌫ ("command + backspace" on macOS) is a noop for the input value. Notice that the controlled value is updated properly.

After

Same sequence as above works as expected—the value is properly cleared on ⌘ + ⌫.

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