[BUG][Qt] Generating code from API with bool properties called valid leads to non-compilable code

[martonmiklos]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• 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?
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Description

openapi-generator version

OpenAPI declaration file content or url

https://demo.inventree.org/api/schema/

It is a demo site, could be accessed with the credentials listed here:
https://inventree.org/demo.html

The following section for e.g.:

    PatchedBomItemValidation:
      type: object
      description: Simple serializer for passing a single boolean field
      properties:
        valid:
          type: boolean
          default: false

generates to the following C++ code:

    bool isValid() const;
    void setValid(const bool &valid);
    bool is_valid_Set() const;
    bool is_valid_Valid() const;

    virtual bool isSet() const override;
    virtual bool isValid() const override;

The last two overridden functions are generated for each class derived from Objects which conflicts with the generated ones.

The problem transitive to the bool properties called set I think.

Suggest a fix

Suffix the conflicting generated method names with an underscore (isValid_(), isSet_())