bug#59141: 28.1.90; Face :extend when all the line but trailing \n is invisible

[Juri Linkov]

>> (progn
>>   (insert "ab")
>>   (let ((o (make-overlay 1 2)))
>>     (overlay-put o 'after-string "!"))
>>   (let ((o (make-overlay 2 3)))
>>     (overlay-put o 'invisible t)))
>>
>> The problem is that "!" from 'after-string' is not displayed,
>> even when it's on the text that is not invisible.
>
> There's no bug here.  after-string is displayed when the end position of the
> overlay is reached, and in this case the end position is invisible, so it is
> skipped.

If really there is no way to display a string overlay before the invisible 
overlay,
this is fine because when a new option will be added, the ellipsis overlay
will be added to the end of the line, and the invisible overlay will start
at the beginning of the next line.