Re: [PATCH v3] Inline image display as part of a new org-link-preview system

[Ihor Radchenko <yantar92@posteo.net>]

Karthik Chikmagalur <karthikchikmagalur@gmail.com> writes:

>>> Do you mean something like this?
>>>
>>> (while (re-search-forward org-link-any-re end t)
>>>   ;; Make overlay ov here
>>>   ;; Find path, link and preview-func here
>>>
>>>   (push (list ov preview-func path link) previews-remaining))
>>>
>>> (dolist (preview-data-chunk (seq-partition previews-remaining 6))
>>>   (run-with-idle-timer
>>> ...
>>> Where the chunk size (6) and the idle time (0.10 seconds) will be
>>> customizable.
>>
>> Yes.
>
> Okay.  There's one more issue to resolve.  An asynchronous preview will
> return t but no preview is placed yet.  If the preview then fails when
> the callback runs, we will have an overlay without a preview that hasn't
> been cleaned up.  How do you suggest handling this case?
>
> The only thing I can think of is that the async preview-func should call
> org-link-preview-clear on the failed preview by itself, and we should
> include this expectation in the org-link-parameters documentation.

Hmm... Not sure. I feel that we are going too far.
Maybe we should use org-pending
<https://list.orgmode.org/65df0895.df0a0220.a68c8.0966@mx.google.com/>
after it is finalized.

For now, my idea is to generalize the asynchronous handling - instead of
doing it within individual preview functions, assume that preview
functions are synchronous, but run them in chunks.

If a preview function is not synchronous, it should take care about
managing the passed overlay by itself.

-- 
Ihor Radchenko // yantar92,
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