Backport "Support cleanup actions in class completers" to 3.3 LTS #500
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Needed to break the loop between completion of class and companion object. If we try to complete the class first, and completion needs the companion object (for instance for processing an import) then the companion object completion would consult the companion class info for constructor that need a constructor proxy in the object. This can lead to a cyclic reference. We now break the cycle by delaying adding constructor proxies in this case to be the last completion action of the companion class.
Needed to break the loop between completion of class and companion object. If we try to complete the class first, and completion needs the companion object (for instance for processing an import) then the companion object completion would consult the companion class info for constructor that need a constructor proxy in the object. This can lead to a cyclic reference. We now break the cycle by delaying adding constructor proxies in this case to be the last completion action of the companion class. [Cherry-picked 9704b0c][modified]
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Backports scala#23515 to the 3.3.7.
PR submitted by the release tooling.
[skip ci]