Ability to turn of FAutocomplete at a runtime

[chris-rutkowski]

While FAutocomplete is great I need an ability to disable in a runtime both:

• suggestion list popover
• typeahead (placeholder autocompleting the first item)

E.g. scenarios:

• user presses ignore suggestions button
• selection from autocompletion is allowed to be triggered only once (especially after this issue Add onSelect callback to FAutocomplete #1033 where the autocompletion scope can be bigger)
• autocompletion enabled only in the form for "adding new item", but not for "editing existing one"

I'd like the FAutocomplete or FAutocompleteController to expose a boolean/method to disable these features and literally convert to ordinary text field. When disabled, if popover or typeahead are currently displayed, popover disappears, and so does typeahead.

Please note1: FAutocomplete contains property enableSuggestions but it is for something very different.

Please note2: I tried to cook some rudimentary solution for this, but it was glitching. Options I tried were:

• having my own suggestionEnabled prop, calling setState and returning empty list from filter and contentBuilder, but those two are not triggered when user inputs stays the same
• for above solution I tried to add a key, FAutocomplete(key: ValueKey('autocomplete_$suggestionEnabled')), but it was causing exceptions saying that notifiers are used after being disposed in various scenarios.

[chris-rutkowski]

Now when I think about this, please consider maybe simpler implementation...

If FAutocomplete is rebuilt (because the parent widget received setState), make all the builders, filters retrigger again. So my rudimentary first solution would work. This is how before I achieved it in Flutter's (Raw)Autocomplete widget.