Po Lu <luangruo@yahoo.com> writes:

>> Yes, each version has its pros and cons.  The child-frame version has
>> the benefit of not occupying a complete line if the context string is
>> shorter.
>
> How could it be shorter than a complete line?

I mean the actual line at window-start is longer than the context
string and so the child-frame's width doesn't cover all of your first
visible line.  Tha happens quite freqently when the open paren starts a
let, a progn, etc.

See attached screenshot.