Hero image - dimension limits ignored when selecting from library

[indigoxela]

Description of the bug

Recently the ability has been added to hero blocks to select existing images. (Finally! Yay!)

But for existing images the dimension limits are completely ignored.

Steps To Reproduce

1. Open the hero block on the home page
2. As hero image select one of the cards images
3. Save

Actual behavior

The cards are 800px wide, nowhere near to the required 1200px (claimed by the field help text). But they're accepted and inserted without nagging.

Expected behavior

Nagging according to min width setting,

Additional information

In fact, this is a problem not only with hero images, but applies to all image fields. Using the image browser bypasses any validation. ... Interesting concept...

It seems like when improving the settings, somewhere on the road the validation was dropped (or never added).
Validation for uploads work as expected.

I'm aware that selecting existing images from library is a bit flaky, but if the text claims that there's a min setting, I'd expect some validation.

It's not urgent, just one of those WTF, that should be fixed...

• Backdrop CMS version: 1.30.x-dev