[BUG] Spring generator bug with x-spring-provide-args + interfaceOnly=true + delegatePattern=true + requestMappingMode=api_interface

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

Spring generator bug with x-spring-provide-args + interfaceOnly=true + delegatePattern=true + requestMappingMode=api_interface:

The generated request-mapped wrapper method, e.g. _foo(String providedArg), includes parameters from x-spring-provide-args, but the wrapper delegates to foo() without passing them. The user-overridable foo(...) method also does not declare those parameters.

openapi-generator version

master

OpenAPI declaration file content or url

Easy reproducer:

tmpdir="$(mktemp -d)" && \
cat > "$tmpdir/x-spring-provide-args-api-interface.yaml" <<'YAML'
openapi: 3.0.3
info:
  title: x-spring-provide-args api interface test
  version: 1.0.0
paths:
  /foo:
    get:
      tags:
        - foo
      operationId: foo
      x-spring-provide-args:
        - "@Size(max = 64) String providedArg"
      responses:
        "204":
          description: no content
YAML
java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate \
  -g spring \
  -i "$tmpdir/x-spring-provide-args-api-interface.yaml" \
  -o "$tmpdir/out" \
  --additional-properties=library=spring-boot,interfaceOnly=true,delegatePattern=true,requestMappingMode=api_interface \
  --global-property=apis,apiTests=false,apiDocs=false,models=false,modelTests=false,modelDocs=false,supportingFiles=false && \
printf '\nGenerated interface:\n%s\n' "$tmpdir/out/src/main/java/org/openapitools/api/FooApi.java" && \
cat "$tmpdir/out/src/main/java/org/openapitools/api/FooApi.java"

Steps to reproduce

Use x-spring-provide-args with delegation.

Related issues/PRs

Suggest a fix

See #24071 (or #24064).

Start by running the provided shell reproducer with the Spring generator and inspect the generated FooApi.java. Compare the request-mapped wrapper and delegated foo(...) signatures when x-spring-provide-args, interfaceOnly, delegatePattern, and requestMappingMode=api_interface are enabled. Done means the provided argument is consistently declared and passed through the generated delegation path.