Simple Autocomplete updates model with both user input and selection

[Mobe91]

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[ x] bug report
[ ] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Current behavior
Currently, the model update behavior of multi autocomplete and simple autocomplete differs. While the multi autocomplete only updates the model with the user's selection, the simple autocomplete updates the model with both the user's input and its selection. It seems the reason for this is to be able to update the autocomplete's input value programmatically (#576).
As a result, a simple autocomplete backed by an array of complex objects sometimes updates the model (i.e. the value prop) with both input strings typed by the user and object values selected by the user. This is not the case in multi mode.

Expected behavior
I think it would be better to introduce a second prop selection that captures the user selection and to use the existing value prop for binding the string content of the autocomplete input.

• React version:
  16.5.2

• PrimeReact version:
  2.0.0-beta.9

• Browser: [all | Chrome XX | Firefox XX | IE XX | Safari XX | Mobile Chrome XX | Android X.X Web Browser | iOS XX Safari | iOS XX UIWebView | iOS XX WKWebView ]
  all

• Language: [all | TypeScript X.X | ES6/7 | ES5]
  all

[cagataycivici]

We'll reconsider if there is more demand, thank you. Currently the behavior is same across all Prime UI libraries.