contao/core — pull request #4213 by Toflar (2012-04-18 15:25:11+00:00)
Title: enable assigning fields to different filter panels

Hi Leo

This enables multiple filter menus in the panelLayout :-)

Code to test:

```
// Original
//$GLOBALS['TL_DCA']['tl_member']['list']['sorting']['panelLayout'] ='filter;sort,search,limit';
$GLOBALS['TL_DCA']['tl_member']['list']['sorting']['panelLayout'] ='filter;sort,search,limit;filter;filter';

// Assign the member groups to the second filter panel
$GLOBALS['TL_DCA']['tl_member']['fields']['groups']['filter'] = 2;
// Assign the member groups to the third filter panel
$GLOBALS['TL_DCA']['tl_member']['fields']['city']['filter'] = 3;
```

It's fully backward compatible as "filter => true" is going to be transformed to "1" and thus assigned to the first panel as we know it :)