InfinitySoft/contao-metapalettes — pull request #3 by Discordier (2012-05-04 13:12:49+00:00)
Title: Fixed issue that the parent palette was not buffered for multiple inheritance

Now you can properly extend from palettes that are also extended.
i.e.:
```php
'metapalettes' => array
(
'_base_' => array
(
'sect1' => array('field1')
),
'_simple_ extends _base_' => array
(
'+sect1' => array('field2 after field1')
),
'_advanced_ extends _simple_' => array
(
'+sect1' => array('field3 after field2')
)
)
```
This was not possible before as the MetaPalette tried to fetch an undefined index (the "parent" palette).