[IMP] owl: add basic support for sub roots #1641
Merged
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In this commit, we extend the owl App class to support multiple sub roots. This is useful for situations where we want to mount sub components in non-managed DOM. This is exactly what the Knowledge app is doing, with mounting views in an html editor.
Currently, this requires some difficult and fragile hacks, and still, the result is that it is very easy to mix components from the main App and a SubApp. But Knowledge does not actually care about creating a sub app. It only needs the possibility to mount sub components in dynamic places.
closes #1640