Hello,

On 2021-06-02 09:18, David Bremner <david@tethera.net> writes:

> The code I posted worked fine for me for one message from a thread of
> 323 messages.

The thread that used to crash (before your patch) was from DeltaChat,
which is an email-based chat app. The thread it produces are like lists
more than trees. So I guess the depth of the tree is what matters.

Best,

Alan