Typing second underscore in a paragraph makes italic from the first one

[vokiel]

TC

1. Start typing in a paragraph with some underscore inside the text, like:

   Just a test variable: VARIABLE_NAME and another variable

2. Continue typing something with _ inside.

Expected: nothing changes.
Current: the whole part from the first _ get italic until the second one, the underscore disappears:

[fredck]

That's certainly and issue with the auto-formatting feature and we must report it at CKEditor 5.

One could say that auto-formatting should be triggered only if the opening marker(_) is in a word boundary. It would not solve all cases, but it would help.

Auto-formatting can be undone, by pressing ctrl/cmd+z right after the formatting happens. It has its learnability issue, but it's hard to say if this will be seen as a bug or an enhancement.

[vokiel]

I would rather use the _ as an opening/closing for the auto-formatting only on the beginning/end of the word respectively. Underscore inside a word should be treated as a regular character.

This case is especially visible here on GH in inline code as it is not possible to format only a part of the code.

[Reinmar]

Yup, upstream issue. Similar to ckeditor/ckeditor5#5862. And perhaps exactly this: ckeditor/ckeditor5#1239.

[Reinmar]

The minimum thing to do would be to disable all automatic things happening inside code blocks and inline code. An even better solution would be to make the opening _ work only when used at the beginning of some word and closing _ only at the end of a word, but that's more tricky.

[fredck]

and closing _ only at the end of a word

I think we're able to check only the start, because the end _, which triggers auto-formatting, happens when the user is typing and we don't know what will be typed next.

[fredck]

I'm considering disabling auto-formatting for italics when typing underscore, for the time being. It is a character used way too often and having such feature seems to cause more harm that good.

WDYGT?

[fredck]

I'm considering disabling auto-formatting for italics when typing underscore, for the time being. It is a character used way too often and having such feature seems to cause more harm that good.

I've decided to go a longer way and reviewed the auto-formatting totally. For more information, check out #105.