[BUG] Mistype in InlineModelResolver leads to autogenerated class name instead of specified by title

[vlsergey]

Bug Report Checklist

• [x] Have you provided a full/minimal spec to reproduce the issue?
• [x] Have you validated the input using an OpenAPI validator (example)?
• [ ] Have you tested with the latest master to confirm the issue still exists?
• [x] Have you searched for related issues/PRs?
• [x] What's the actual output vs expected output?
• [ ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The problem occurs with following input:

components:
  schemas:
    Root:
      type: object
      additionalProperties:
        title: TestValueModel
        type: object
        properties:
          name:
            type: String

I expect number of value class to be TestValueModel. Instead it is generated as RootValue.

This is happens because of mistype in InlineModelResolver :: gatherInlineModels at line 317: https://github.com/OpenAPITools/openapi-generator/blob/f145b8962d3c3bb2692841b5c093aa24a5296cde/modules/openapi-generator/src/main/java/org/openapitools/codegen/InlineModelResolver.java#L317

            // Check additionalProperties for inline models
            if (schema.getAdditionalProperties() != null) {
                if (schema.getAdditionalProperties() instanceof Schema) {
                    Schema inner = (Schema) schema.getAdditionalProperties();
                    if (inner != null) {
                        String schemaName = resolveModelName(schema.getTitle(), modelPrefix + this.inlineSchemaOptions.get("MAP_ITEM_SUFFIX"));
                        // Recurse to create $refs for inner models
                        gatherInlineModels(inner, schemaName);
                        if (isModelNeeded(inner)) {
                            // If this schema should be split into its own model, do so
                            Schema refSchema = this.makeSchemaInComponents(schemaName, inner);
                            schema.setAdditionalProperties(refSchema);
                        }
                    }
                }
            }

instead of schema.getTitle() inner schema title inner.getTitle() should be used.

openapi-generator version

6.6.0, but bug is still in trunk

Generation Details

spring generator for Java

Steps to reproduce

Related issues/PRs

Suggest a fix

[wing328]

instead of schema.getTitle() inner schema title inner.getTitle() should be used.

can you please file a PR with the suggested fix when you've time?