On 01/03/2023 14:10, Po Lu wrote:
> This log (``err-okay.log'') was generated when you encountered the
> problem, right?

Nope, it's for the "no problem" case. Hence the name.

> Because here, the buffer swap happens 400 ms after
> the frame title changes.
> 
>> x_set_title: *scratch* - GNU Emacs at potemkin, 554169702405
>> show_back_buffer: 554169844161
>> show_back_buffer: 554169930769
>> show_back_buffer: 554169943915
>> show_back_buffer: 554170059535
>> show_back_buffer: 554170197598
>> show_back_buffer: 554170246100
>> x_set_title: xassociations.rb - GNU Emacs at potemkin, 554170246258
>> show_back_buffer: 554170256469
>> show_back_buffer: 554170744241
> 
> While these two appear to be fine, with the buffer swap happening only
> ~15ms afterwards.  So are you sure your description is correct?

I am sure, but just to verify, I redid the experiment again. See 
attached files, the naming scheme is the same: two problem cases and one 
"okay" case.