xamidi

Possibly [59463ec](https://github.com/wxWidgets/wxWidgets/commit/59463eced472e11a6a93774442a070ba398e164a) fixes it, since it affects wxBookCtrlBase, from which wxAccordion is inherited. However, the bug is present for all versions prior to 3.1.7. I modified your widget to fix...

I recently noticed that \ is not supported yet. Would be great to have it. There is no way right now to render text via svgren, correct?