When a multiselect field is very long, it can be difficult to find the right items. Thats why some form of autocomplete can help.For instance showing that items starting with ‘A’ when you type ‘A’
I would also really like to see this being added. A search bar makes selecting faster because you don’t have to scroll a large list. I would rather add a search bar than call this autocomplete. Below I describe a possible UI I have seen somewhere else (I don’t know where anymore).
I think you need to insert a search bar above the first result but below the input field (so at the red line in the image below). Searching there limits the selectable options which you can then select. If you clear the search bar, you should see all items again. Selecting options in a filtered selection list should not clear the already selected items (maybe hidden due to the filter). That way, you should be able to select all items you need with multiple searches.
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