[BUG] Generated enum constants have triple underscore when original contains ' - '

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?

Description

After this fix: https://github.com/OpenAPITools/openapi-generator/pull/21459, when the original string contains a hyphen, surrounded by spaces, the generated enum constant now has three underscores:

"This - string" becomes "THIS___STRING"

Suggested fix: In this file:

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java

Replace

modified = value.replaceAll("-", "_");

with:

modified = value.replaceAll(" - ", "_");
modified = value.replaceAll("-", "_");

It could also be that it needs to be fixed on a more fundamental level, because otherwise, there will probably be other edge cases as well.

openapi-generator version

7.15.0

Start in modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java and inspect the enum-constant transformation affected by PR 21459. Reproduce the "This - string" case, correct the generated name without introducing extra underscores, and verify the resulting generated output against the reported expectation.