bug#60692: 29.0.60; current-indentation wrong without outline ellipsis

[Juri Linkov]

> If you've read the discussion of bug#56837, then I explained there why
> this is how it is.  In a nutshell, indentation is regarded as
> display-related aspect, so asking about indentation of invisible text
> makes no sense.

But when an ellipsis is used, current-indentation
works correctly in invisible text.

>>   (setq-local outline-level
>>               (lambda ()
>>                 "`outline-level' function for Python mode."
>>                 (1+ (/ (current-indentation) python-indent-offset))))
>>
>>   (setq-local outline-level (lambda () (1+ (/ (current-indentation)
>>                                          ruby-indent-level))))
>>
>> But this fails when users want to remove an ellipsis.
>
> I'm surprised the indentation is used for this purpose when it is
> known that text will be sometimes hidden.  May I suggest to use text
> properties for this purpose?

I don't understand how text properties could be used to get
the indentation.