On 26/04/2020 09.43, Eli Zaretskii wrote:
>> From: Clément Pit-Claudel <cpitclaudel@gmail.com>
>> Date: Sat, 25 Apr 2020 23:40:38 -0400
>>
>> The following snippet inserts a button with a long label and a wrap-prefix.  Clicking the prefix causes an error, whose backtrace is shown below.
> 
> Isn't that a cockpit error?

Here's a tentative patch, but I can't claim to understand the button.el code well :/