Inline styling (bold, italic, link) is lost on paste

[Reinmar]

1. Open http://localhost:8125/ckeditor5-presets/tests/manual/article.html
2. Copy the entire "Bold Italic Link" line (but do not leave the paragraph).
3. Paste it somewhere in this sample.

The styling is lost.

It's a regression introduced in 0.10.0.

It's either in the clipboard (handling disallowed content) or in schema rules which we changed then.

[Reinmar]

Nooooo... This is the schema again.

The issue was introduced by https://github.com/ckeditor/ckeditor5-basic-styles/issues/40. With this limitation, the content cannot be processed inside $clipboardHolder even though it allows $text inside. It inherits from $root (to allow all that the root allows) but we also allowed text inside. But it's not a $block so it all blows up.

What I'd need to do is to be able to say that $cliboardHolder should allow everything which $root and $block do. Or to tell that a certain attribute is allowed on $text wherever text is allowed. Either way, we need to rewrite Schema (https://github.com/ckeditor/ckeditor5-engine/issues/532).

The only workaround is to specifically allow bold, italic, links, etc in $clipboardHolder. But this is extremely ugly.

[Reinmar]

I'll go with the workaround now but it'll mess our code even more and will solve only this specific issue. I think that pasting e.g. a <blockquote>text<b>text</b></blockquote> from some website will still fail because blockQuote doesn't inherit from $block too and I can't hardcode allowing these attributes in the block quotes because it's just plain wrong and have hard to predict results.

[Reinmar]

I pushed commits to 3 repos (listed above). The issue is gone... for a while.