SearchField without icon: Autocomplete

[nbonamy]

Use case

For an app I am developing I need an autocomplete text field which is basically a MacosSearchField without decoration (no magnifier icon, no clear button).

Proposal

I already have a PR ready with the following implementation:

• Created a MacosAutoCompleteField which is basically the MacosSearchField source code with prefix and clearButtonMode as paramters
• MacosSearchField is just a specialized MacosAutoCompleteField with predefined values for prefix and clearButtonMode

Another more simple implementation would to simply allow prefix and clearButtonMode to be user specified in MacosSearchField.

If you're OK to add this to macos_ui, then tell me which solution you prefer and I'll create a PR.

[nbonamy]

https://github.com/nbonamy/macos_ui/tree/autocomplete