test for struct bureaucracy multi field bug

[micgro42]

Currently, it is not possible to use struct multi fields with bureaucracy forms.

There seem to be two issues that are related to this:

• Error when create new page and new entry with Bureaucracy form with Struct splitbrain/dokuwiki-plugin-bureaucracy#246
• Template action ignores template name and breaks existing forms splitbrain/dokuwiki-plugin-bureaucracy#235

The problem is that for a multi-field the $value is not a string, but an array and in line 475 in the buraucracy plugin we try to replace a string-pattern with an array of values. That fails and preg_replace returns something falsy:

https://github.com/splitbrain/dokuwiki-plugin-bureaucracy/blob/7357d7100908ee44b2bc672128301825c9dcb8f4/syntax.php#L466-L478

I'm not yet sure where/how to fix that. Based on the issues above, reverting to an earlier version of bureaucracy works, so a fix should be consistent with whatever that earlier version of bureaucracy does.

The place above would be an obvious possible place to join the array elements, alternatively this could also be done in the respective field helper in the struct plugin before the value is set:

dokuwiki-plugin-struct/helper/field.php

Line 64 in a8bbb00

$this->opt['value'] = $value;

This needs a bit more research.