Table: "Edit as HTML" minifies the code

[manake]

I have a table and clicking "Edit as HTML" shows table's HTML but it's all minified (even though I pasted it as clean).

Can the block not compress/destroy the code that I pasted?

[manake]

Whatever is happening with this block this is not usable...

I see some random "This block has been modified externally." like 10th time already while editing this single table.

1. I think there is some problem with adding "custom CSS class" to it and that breaks the block.
2. Create table block > edit html > edit something in that html > block breaks. (But if I just paste the same exact HTML in the editor then it works.)

I use this block for the first time ever and I can't make a table so far without irreversible error. Frustrating.

[manake]

It'd say this is a "bug" rather than "help request". I don't need help because I already managed to make it work but I'm reporting this because this involved a lot of frustration and wasted time.

It's completely unclear under what circumstances "This block has been modified externally." appears. It may be one/some of the following:

• If I edit table's class in "HTML mode" then the block breaks.
• Or when I add "colspan" then it can break.
• Or when I convert "td" to "th" in "HTML mode".

I don't know. I know that I'm trying to build a table but it prevents me from doing this.

And it leaves me no choice but to delete the block and re-create it every time.

Proposed solution
"This block has been modified externally." should never appear.

[swissspidy]

This has come up multiple times in the past, see for example #6826. Current discussion happens at #7604.

[ZebulanStanphill]

Also note that the Table block is getting some rewrites and enhancements. See #6923 and #8767.

[manake]

Thank you for your responses. I'll close this if the discussion is happening elsewhere.

Last thing I want to emphasize: If it wasn't destroying my work (if I could edit HTML without "This block has been modified externally.") then I would be happy with this block. The remaining UI changes are not important to me. I only want it to not break.