[Bug] Regression: nested mixed lists no longer work #4341

Description

After upgrading from MarkText 0.17.1 to 0.19.0, it is no longer possible to nest one list type inside another.

Steps to Reproduce

1. Load the following file in MarkText: markdown combined number & bullet list.md

Expected Behavior

The file should appear as it does in MarkText 0.17.1, with an indented bulleted list inside the numbered list:

Actual Behavior

The indented bulleted list does not display as a list, as can be seen in this screenshot from MarkText 0.19.0:

Screenshots / Logs

No response

Operating System

Linux (Flatpak)

MarkText Version

0.19.0

OS Version

Fedora Linux 44 KDE Plasma Desktop Edition

Reproducibility

• I can reliably reproduce this issue