Support for extended text descriptions syntax (pro-only)

[josteink]

As seen in the documentation, you can create extended text descriptions by having your text indented relative to the sequence script:

  This is the extended text description

A->: This is regular syntax

Implementing support for this syntax will involve a several challenges:

1. Getting correct indentation while editing. This is probably the simplest thing to implement support for.
2. Getting correct indentation if/when a user asks to reflow/reindent a whole document.
3. Should this blocks have a particular kind of fontification? If so, fontification has to be aware of the current "proper" indentation level of each line.

Implementing full support for this feature is not a priority for several reasons:

• Implementing support for 1 is probably doable, but will most likely introduce annoying bugs until 2 is fully supported too.
• Implementing support for 3 will require an entire new kind of code-base for fontification and will most likely affect performance too.

CC: @dlasko

[josteink]

Testing out this feature shows that "here be dragons".

Basically anything with a text-indent more than one space is considered a extended text description (ETD), unless recognized as normal WSD-syntax.

While this at first makes it seem easier to fully support, it comes with a few gotchas:

• Every character after the initial space is considered part of the ETD.
• Consecutive lines without a paragraph break is considered a paragragph.

This means that ETDs indented at the same level as other markup will look funny.

Consider the following script:

title Demo document

opt Indetation and EDT
    alt EDTs gets indented deep

         Bob talks to Alice.
         Alice suggest coffee.

        Bob->Alice: Hey!

    end
end

Which will render like this:

That's obviously no good.

To support this feature properly, wsd-mode will need to pre-process such text-blocks before sending them to the WSD website. An alternate approach to this particular issue is submitting a bug-report to the WSD website itself.

[josteink]

A bug-report has been filed on this particular issue. Work on this issue may resume later based on the outcome.

[josteink]

Bug-report has been received and fixed on the wsd website.

This means a solution can be drafted for wsd-mode.