Fix infinite recursion with recursive schemas

[Avaq]

The following schema demonstrates the issue:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$ref": "#/$defs/Json.Value",
  "$defs": {
    "Json.Value": {
      "anyOf": [
        { "$ref": "#/$defs/Json.Primitive" },
        { "$ref": "#/$defs/Json.Array" },
        { "$ref": "#/$defs/Json.Record" }
      ]
    },
    "Json.Primitive": {
      "anyOf": [
        { "type": "boolean" },
        { "type": "number" },
        { "type": "string" },
        { "type": "null" }
      ]
    },
    "Json.Array": {
      "type": "array",
      "items": { "$ref": "#/$defs/Json.Value" }
    },
    "Json.Record": {
      "type": "object",
      "required": [],
      "properties": {},
      "additionalProperties": { "$ref": "#/$defs/Json.Value" }
    }
  }
}

Save that to input.json, and run:

generate-schema-doc --no-link-to-reused-ref --config show_breadcrumbs=false input.json output.html

Before the proposed changes, this would lead to a RecursionError: maximum recursion depth exceeded. With the changes in place, the output.html generates as desired.

I also tested against the schema posted in #246, and it resolves the issue there, too.

The proposed fix was mainly the result of the analysis of an LLM, and didn't come from a place of personal understanding of the code. Caution advised while reviewing.

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• Fixes Bug: RecursionError: maximum recursion depth exceeded #246