Code block should show invisible characters

[sarahmonster]

In order to make it easier for people to write code in the code block and see what they're doing, it would be nice to show invisible characters (spaces, tabs, returns, etc) in a subtle way, like (most) code editors do.

Additionally, it would be good if we could allow people (especially WordPress people) to type tabs into the field, but I suspect this would cause some accessibility headaches and thus totally isn't worth it.

[paaljoachim]

Hey Sarah.

It looks like this issue got forgotten about.
What should we do with it?

Have a great day!

[holzee]

Needed for code blocks. Would love to have invisible characters in paragraph blocks too. Would be helpful for editing ! (Non-breaking spaces i.e.).

[mtias]

For code blocks, this will probably be part of syntax highlighting (#5614, #10423) more than a change on the block itself. Not planning on adding this for paragraph, but could be a cool plugin.