Re: A question about overlays and performance.

[Ihor Radchenko]

> The recommending way to avoid this problem is to provide a patch which
> extends Isearch's handling of invisible text to text-properties.
> There's no reason to presume it would be hard to do.

See the attached.

> And the way I recommend to avoid this problem is to stay clear of
> indirect buffers (which I consider as an attractive nuisance).

It is not always possible. I am currently working on re-implementing
org-mode folding from using overlays to text-properties. However, it is
not possible to stay clear of indirect buffers in org-mode. Many
user packages and core code depend on indirect buffer functionality
(including different folding state). I will have to go ahead using my
"hacky" solution with char-property-alias-alist.

Best,
Ihor

iseach-text-properties.patch
Description: Text Data

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> - text hidden via text properties is not well-handled by isearch. For
>>   overlays, isearch can temporary reveal the hidden text, which is not
>>   the case for text hidden using 'invisible text property.
>
> The recommending way to avoid this problem is to provide a patch which
> extends Isearch's handling of invisible text to text-properties.
> There's no reason to presume it would be hard to do.
>
>> - text properties are not buffer-local in indirect buffers. With
>>   overlays, it is possible to have define hidden text in basic and
>>   indirect buffer independently. However, text properties will always be
>>   shared and the text hidden in indirect buffer will automatically be
>>   hidden in the base buffer as well.
>
> And the way I recommend to avoid this problem is to stay clear of
> indirect buffers (which I consider as an attractive nuisance).
>
>
>         Stefan
>

-- 
Ihor Radchenko,
PhD,
Center for Advancing Materials Performance from the Nanoscale (CAMP-nano)
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong 
University, Xi'an, China
Email: yantar92@gmail.com, ihor_radchenko@alumni.sutd.edu.sg