When the module renders a Svg file that contains a <pattern> element, it might end up rendering it recursively leading to stack overflow DoS

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

• REF_URL_NOT_ALLOWLISTED url not in allowlist: https://codereview.qt-project.org/c/qt/qtsvg/+/654200