On 06/02/2023 18:46, Bruno Barbier wrote:
> 
> After asking Thunderbird to register itself as the default mail
> application, "mid:" seems to be working from everywhere.

A have prepared an alternative patch. Let me know if have suggestions, 
objections, or if you prefer to proceed with another revision of your patch.

It seems you had no plan to polish your Org and system configuration to 
such degree.