[x] feature request
Codepen example
https://codepen.io/moroshko/pen/qbRNjV
It would be nice to have an option to create sections (or styleable, non-selectable items) within .ui-autocomplete-items and .ui-dropdown-items. See this example from React-Autosuggest or at their codepen link above.
Screenshot of the example linked above:

Angular version: 2.0.X
4.3.2
PrimeNG version: 2.0.X
4.1.2
We have this at PrimeFaces;
https://www.primefaces.org/showcase/ui/input/oneMenu.xhtml
Can do similar for p-dropdown as well using new SelectItemGroup API.
Scheduled for 5.3.
Done!

It is very useful if we can choose the group header as an option of the dropdown.
It's like if Germany is a global option.
can we achieve grouping for p-autocomplete using selectItemgroup?