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02ea0e77a1
This simplifies some logic in `languagetree.lua`, removing the need for `_has_regions`, and removing side effects in `:included_regions()`. Before: - Edit is made which sets `_regions = nil` - Upon the next call to `included_regions()` (usually right after we marked `_regions` as `nil` due to an `_iter_regions()` call), if `_regions` is nil, we repopulate the table (as long as the tree actually has regions) After: - Edit is made which resets `_regions` if it exists - `included_regions()` no longer needs to perform this logic itself, and also no longer needs to read a `_has_regions` variable