Frederic Massart 356ec27f08 MDL-44747 editor_atto: Improved validation of toolbar config
This ensures that:
- Plugins are only used once,
- Group names are unique,
- Lines match: group = plugin[, plugin[, plugin ...]],
- There are some groups and plugins defined,
- The plugins used are installed.
2014-03-31 11:28:43 +08:00
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2014-03-14 13:40:11 +08:00
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