JavaDoc request: ParserDefinition.SpaceRequirements and #spaceExistanceType

This method is a new requirement for 6.0 but it is not documented. My guess is that, when two fragments of language A are embedded in language B, IntelliJ calls this method on the PD for language A in order to determine how to merge the two fragments together. But, it is not clear to me exactly how this is supposed to work.

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