[IDEA] Allow empty lines to be rendered

[linonetwo]

Is your idea related to a problem? Please describe.

WYSIWYG editor allows pressing Enter to create empty line, but if wikitext rule doesn't allows multiple empty line, user created empty lines will suddently disappear.

Describe the solution you'd like

Explicitly add "blankline" to AST, so rendere and editor knows there are blank lines in the source file.

Describe alternatives you've considered

Add feature option like preserveBlankLines, enable when WYSIWYG editor is parsing the wikitext.

Additional context

I'm fixing WYSIWYG editor bug that new line disappear. In a WYSIWYG editor, user may press multiple Enter to create an empty space, for thoughts or leave blank, but it will collapse if underlying syntax don't support it.

[linonetwo]

HANDOFF.zip

Situation report to remaind the full context.

[Jermolene]

Hi @linonetwo is there any reason not to use a BR element?

[pmario]

I think BR will cause problems with a text-1 -> WYSIWYG -> text-2
text-1 has newlines only. text-2 would have BRs which is wrong

[linonetwo]

Yes, I'm handling 2-way-sync here, If there are new empty lines in a text, editor should show lines in real time, and if user press multiple Enter, new lines should save back to text.

As a WYSIWYG editor, <br> should show as HTML block, which shows the rendered result, and allows edit the source HTML text.

[Jermolene]

I think BR will cause problems with a text-1 -> WYSIWYG -> text-2 text-1 has newlines only. text-2 would have BRs which is wrong

I was expecting that the HTML generated by the editor would always be valid HTML, something like this:

<p>
…
</p>
<br>
<br>
<p>
…
</p>
<br>
<br>

[linonetwo]

HTML generated by the editor

But the editor generates wiki text, not HTML. Although I will support editing existing HTML content like style / script / br / div / p tags. By default everything should be simple wikitext. No P tag here.

What generates HTML tag is the renderer (widget class), if you said it should output br, that is fair.

wikitext -> WYSIWYG -> wikitext -> widget renderer -> HTML

And I want to ask Historically, why no multi-empty-line support?