This is ticket is for the autocomplete plugin at: http://dev.jquery.com/browser/trunk/plugins/autocomplete

When enabling the multiple option and setting the multipleSeparator option to a single space, autocomplete does not work anymore. This setup is quite common for tagging fields, in which you enter multiple tags separated by spaces.

I found the cause of the problem to be the following snippet:

function trimWords(value) {
 if ( !value ) {
   return [""];
 }
 var words = value.split( $.trim( options.multipleSeparator ) );
 var result = [];
 // ...
}

Calling $.trim on options.multipleSeparator removes the space and breaks the functionality of the plugin. This can be fixed by removing the call to $.trim on options.multipleSeparator.

I'm attaching a patch for this.

Thank you.