Autocomplete (Tags style) doesn't allow multiple values

No answer yet? :(

i have modified it to support multiple by adding
'#multiple' => TRUE,
in form API

updated, for a bug fix

#3 Code works correctly, and the field is rendered correctly too. Thanks.

#3 works for element which was created with Form API only. It doesn't resolve the issue.

This code, instead of the snippet in #3, enables the multi value widget for me:

  $field_info = field_info_field($element['#field_name']);
  if ($field_info['cardinality'] != 1) {
    $element['#attributes']['multiple'] = 'multiple';
    $element['#attributes']['name'] .= '[]';
  }

But it does not yet save the value.

The I'm using a.t.m. is to process the results in a validate function next to using #6:

  // First item in array in Null, remove that one
  array_shift($form_state['input']['my_field'][LANGUAGE_NONE]);
  foreach ($form_state['input']['my_field'][LANGUAGE_NONE] as $item) {
    // Set the values
    preg_match_all('/\((.*?)\)/', $item, $matches);
    $form_state['values']['my_field'][LANGUAGE_NONE][]['target_id'] = $matches[1][0];
  }

@botris where did you put your code? Could you please share an example?

@EugeneChechel so I used this code in a custom form, and it works for submissions, but when editing an existing form I got in real trouble :)
So after a while of debugging I decided it was too much time to work around, so I don't use Chosen ajax anymore, the combination I use now that works really well is:
https://www.drupal.org/project/autocomplete_deluxe
with https://www.drupal.org/project/acdx_references
patched with https://www.drupal.org/node/1295034#comment-10329839

If you do decide to stick with Chosen ajax you would put the part from #6 in your form code or when altering an existing form in a hook_form_alter().
The code from #7 would go in a form validation function.
Hope that helps.

Here is a patch that makes this work for me.

Patch was created incorrectly. I fixed the patch and remove unneeded code.

This issue is fixed. I would really appreciate it if anyone could test this. Perhaps @Mike Draconid, @botris, @chertzog, or anyone else that gets this message could test.

Small change to patch that removes the size attribute from the select html tag. Adds 'form-select' class to the html select element to conform with Drupal.

One more fix when using chosen ajax single item.

Notice: Undefined index: multiple in chosen_ajax_theme_textfield() (line 219 of /sites/all/modules/chosen_ajax/chosen_ajax.module).

Updated patch. Solves many issues.

A fix for single chosen when creating new content.

More updates and changes.

Removed watchdog output.

New patch. Everything should be good with this one.

Tested with....
autocomplete, cardinality 1, non fixed display
autocomplete, cardinality unlimited, non fixed display
autocomplete, cardinality 1, fixed display
autocomplete, cardinality unlimited, fixed display
autocomplete, cardinality 1, non fixed display, required
autocomplete, cardinality unlimited, non fixed display, required
autocomplete, cardinality 1, fixed display, required
autocomplete, cardinality unlimited, fixed display, required
autocomplete tags, cardinality 1, non fixed display
autocomplete tags, cardinality unlimited, non fixed display
autocomplete tags, cardinality 1, fixed display
autocomplete tags, cardinality unlimited, fixed display
autocomplete tags, cardinality 1, non fixed display, required
autocomplete tags, cardinality unlimited, non fixed display, required
autocomplete tags, cardinality 1, fixed display, required
autocomplete tags, cardinality unlimited, fixed display, required

Any updates?

@monstrfolk thanks a lot for the patch.