Support generating nested HTML list from tree of tabs

[piroor]

Short description

Currently there is no way to generate nested HTML list. See also: piroor/treestyletab#3618

Steps to reproduce

1. Start Firefox with clean profile.
2. Install this addon.
3. Add rule to generate HTML list.
4. Prepare a nested tree of tabs.
5. Select them and copy it as an HTML list.

Expected result

A nested list is copied as:

<ul>
  <li><a href="..."></a>
    <ul>
      <li><a href="..."></a>
        <ul>
          <li><a href="..."></a></li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

Actual result

A flat list is copied as:

<ul>
<li><a href="..."></a></li>
<li><a href="..."></a></li>
<li><a href="..."></a></li>
</ul>

Environment

• Platform (OS): All
• Version of Firefox: All
• Version (or revision) of CSTTC: 1.6.6

[piroor]

An idea of the syntax to support such nested lists:

%RT%%PREFIX(<ul>%EOL%)%%SUFFIX(</ul>%EOL%)%<li><a href="%URL_HTMLIFIED%">%TITLE_HTMLIFIED%</a>%CHILDREN%</li>%EOL%

%EOL%%CHILDREN% will be added to the end of the definition automatically if the rule does not contain %CHILDREN%.