The valuable Write panel bug

[wion]

I edited the Write panel doc a bit ago, adding a tip under the Custom fields section in relation to isolating the ID value of an image in the Article image field.

Bloke pointed out it's a (useful) bug...
https://forum.textpattern.io/viewtopic.php?pid=307670#p307670

I would argue it's useful enough to doc as I've done, at least until the bug is ever fixed or a core solution materializes to grab the raw ID value from the images field.

[philwareham]

Great, thanks Destry. Looks fine to me.

[wion]

Improvements needed, based on discussion in the thread.

[wion]

I've opted to remove mention of the useful "custom field" bug entirely and just highlight a tip under the Article image section of the Write panel doc about how to isolate the ID with tags other than the article_image tag. I think that's useful there, and it recycles the markup example used previously, but with a lean on the short-form notation of writing it.

[wion]

@Bloke has been following the associated forum thread, so if I've fudged anything up in meaning, he might be quick to spot it.