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Fixes #2500.
Argument group validation was formatting required options with
=, even when the command configured a different separator. This could produce messages such as--output=<output>for commands that only accept--output:<output>.The problem came from two group-validation paths using an
ArgSpec.describeoverload that always used=. This change passes the command's configured separator through both paths.I added regression coverage for a partially specified group and for a group matched through a required child group.
Tests:
.\gradlew.bat :test --tests picocli.ArgGroupTest.\gradlew.bat build --no-daemon