I was able to implement it the following way:

In suggestions_textfield.dart, line 154 and 155 currently do:

_matches =  _suggestions.where((String sgt) => sgt.startsWith(str)).toList();

I replaced this with:

_matches = _suggestions.where((String sgt) => sgt.toLowerCase().startsWith(str.toLowerCase())).toList();

_matches = _matches.map((match) => match.replaceFirst(match.substring(0, str.length), str)).toList();

Then, for the TagsTextField widget:

textField: TagsTextField(
    duplicates: true,
    ...
    onSubmitted: (newTagStr) {
        String tagName = suggestions.firstWhere((suggestion) => suggestion.toLowerCase() == newTagStr.toLowerCase(), orElse: () => null);
        if (tagName != null) {
            newTagStr = tagName;
        }
        if (!tags.map((tag) => tag.title.toLowerCase()).toList().contains(newTagStr.toLowerCase())) {
            setState(() {
                tags.add(Item(
                    index: tags.length,
                    title: newTagStr,
                    active: true,
                    customData: true
                ));
            });
        }
    }
}

Can the suggestions prop not be case-sensitive? #52

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