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[WIP] Fix thing creation with updated XML #6537
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Fixes #2555
This is intended as a design-idea. I would appreciate some comments.
Basically this lets the thing creation wait for the handler factory to be available and then checks if the stored managed thing has all channels a newly created thing of the same type would have.
Missing channels are added, channels with changed
ChannelTypeUID
or accepted item-types are updated to the new version.Removed channels are not removed, which is a little bit unsatisfying and still different from the textual configuration. I'll have to check if it is possible to find out which channels (especially in extensible things) are user-added and should be preserved.