extensions/markdown-language-features/src/markdownEngine.ts/MarkdownItEngine/_addImageRenderer
class MarkdownItEngine:	private _addImageRenderer(md: MarkdownIt): void {
		const original = md.renderer.rules.image;
		md.renderer.rules.image = (tokens: Token[], idx: number, options, env: RenderEnv, self) => {
			const token = tokens[idx];
			const src = token.attrGet('src');
			if (src) {
				env.containingImages?.add(src);

				if (!token.attrGet('data-src')) {
					token.attrSet('src', this._toResourceUri(src, env.currentDocument, env.resourceProvider));
					token.attrSet('data-src', src);
				}
			}

			if (original) {
				return original(tokens, idx, options, env, self);
			} else {
				return self.renderToken(tokens, idx, options);
			}
		};
	}