Media grid all items also shouldn't use full or large sizes

[oiler]

This is a follow-up to #29498.

It looks to me like the logic added in #29498 also needs to be applied in line 438 of wp-includes/media-template.php

More to the point, I also strongly argue that using full size as a fallback if 'large' has been deregistered isn't a good idea. This could lead to an initial page load of well over 100MB. Every effort to check for other sizes - specifically the thumbnail size - should be made before loading the full size image into this thumb grid.

[wonderboymusic]

Agreed, thanks for the report. I would load thumbnail before full here. 30861.diff​

[wonderboymusic]

In 31039:

In Media Grid, don't immediately load full size images if the requested size passed to wp.media.view.Attachment.imageSize() does not exist, look for other suitable sizes.

Fixes #30861.