CKEditor 4 and figure widget, how to express "title caption" or two figcaptions? - html

Question

The CKEditor 4.3 demo show an example of widget for work with HTML5 figure tag.
As a user (editing the demo text) I can not edit a second figcaption (one before image, as "figure title", and other after image, as caption): when edit (by CKEditor's source code) before, it goes after, when I add a paragraph (p tag) before image, also goes after. So, there are no way to user express distinct "head-caption" and "foot-caption", always CKeditor put after image.
There are some configuration to enable "head-captions"?
The edited source code:
<figure class="caption" style="float:right">
<figcaption>HEAD - Test</figcaption>
<img alt="Apollo-CSM-LM"
src="http://b.cksource.com/a/1/img/demo/apollo-csm-lm.png" width="200" />
<figcaption>FOOT - Apollo CMS-LM spacecraft</figcaption>
</figure>
So, CKEditor transforms into,
<figure class="caption" style="float:right">
<img alt="Apollo-CSM-LM"
src="http://b.cksource.com/a/1/img/demo/apollo-csm-lm.png" width="200" />
<figcaption>HEAD - Test</figcaption>
<figcaption>FOOT - Apollo CMS-LM spacecraft</figcaption>
</figure>
Idem with <p>HEAD - Test</p>. If I use only the <figcaption>HEAD - Test</figcaption>, it also goes after image (impossible to express a "before img caption").
NOTE-1: "head" and "foot" figcaptions are both valid in HTML5, as showed in this fiddle.
NOTE-2: another problem is a caption with more than one paragraph. CKEditor transforms it in a BR, that is not what author need in a typical journal.
NOTE-3: for this related needs — use of paragraphs, use of "before image" caption, and use of two captions —, see all needs of a typical journal at an stable standard like JATS fig element, or millions of article examples at PMC.

Answer 1

Short answer - no, there is no config option for that.
Some details - you're using the image widget, which is supposed to handle figure.caption>img+figcaption case. Specific widget may not work with every possible input and it happens in this case.
If you want to remove that limitation there are two ways:
Don't use the image widget by disabling it or remove class="caption" from your HTML. For example this HTML will not be changed:
<figure>
<figcaption>1</figcaption>
<img src="..." ...>
<figcaption>2</figcaption>
</figure>
Also, the enter key will work in a standard way inside figcaptions (will create <p> tags).
The other way, if you want to use the image widget, is to modify its behaviour. In case of simple widgets it can be done without touching widget code, inn the widgetDefinition event listener. However, image widget is pretty complex, so you'd have to change its code.
To change enter key behaviour, just change the widgetDefinition.editables.caption.allowedContent - it has to contain a p tag. This part can be done in widgetDefinition listener.
In order to be able to use two captions, you'd have to add another nested editable and modify the plugin code, because it handles only img+figcaption case.