Experimental Feature: New ImageBlock for StreamField (Work in Progress)

[Chiemezuo]

This is an experimental feature I'm demoing for my GSoC proposal.
It is a new StreamField block called ImageBlock.
It's a work in progress, but I'd like it to form a basis for my potential conversations about the 'alt text project' with mentors @Stormheg @SaptakS and @thibaudcolas

This is a sample of what the ImageBlock would look like:

And this is what a sample of what it would look like from the console output:

[squash-labs]

Manage this branch in Squash

Test this branch here: https://chiemezuofeatureexperimental-i-v7p7b.squash.io

[Stormheg]

Have yet to try this out on a Wagtail installation, but this is already looks amazing to me! Good work 👍

[Chiemezuo]

Thank you, @Stormheg :)

[Stormheg]

Suggested change

	# Use assertRaises as a context manager to check if a ValidationError is raised
	with self.assertRaises(StructBlockValidationError) as context:
	block.clean(block.to_python(value))
	# No alt text is given and the image is not marked decorative, this is an invalid state and should raise an error
	with self.assertRaises(StructBlockValidationError) as context:
	block.clean(block.to_python(value))

[Stormheg]

Tip: don't explain what the code is doing. Instead, explain why it is doing something.

In this instance: why are we expecting an exception to be raised.

[Stormheg]

ditto the above