style attribute "margin" property is missing fourth element after sanitizing

[janis-github]

The margin property is missing left alignment value after sanitisation.

Here is the code:

     private static final CssSchema MY_CSSSCHEMA = CssSchema.withProperties(ImmutableSet.of(
          "margin",
          "list-style-type",
          "vertical-align"
  ));

   PolicyFactory policy = new HtmlPolicyBuilder()
        .allowAttributes("class")
        .onElements("li")
        .allowAttributes("checked", "type")
        .onElements("input")
        .allowElements("i", "u", "b", "p", "pre", "blockquote", "tt", "em", "ul", "ol", "br", "li", "sub", "sup", "div",
            "table", "img", "a", "tbody", "tr", "td", "strong", "span", "h1", "h2", "h3", "code", "md", "video",
            "source", "th", "thead", "h4", "h5", "h6", "h7", "h8", "h9", "h10", "h11", "hr")
        .allowStyling(MY_CSSSCHEMA)
        .toFactory();
    String postSanitize = policy.sanitize(text).trim();

This is my input string:

<ul>
<li class="task-list-item" style="list-style-type: none;"><input type="checkbox" disabled style="margin: 0px 0.35em 0.25em -1.6em; vertical-align: middle;" checked> This is a complete item</li>
<li class="task-list-item" style="list-style-type: none;"><input type="checkbox" disabled style="margin: 0px 0.35em 0.25em -1.6em; vertical-align: middle;"> This is an incomplete item</li>
</ul>

Here is the output:

<ul><li class="task-list-item"><input type="checkbox" style="margin:0px 0.35em 0.25em" checked="checked" disabled="1" /> This is a complete item</li><li class="task-list-item"><input type="checkbox" style="margin:0px 0.35em 0.25em" disabled="1" /> This is an incomplete item</li></ul>

Note that

style="margin:0px 0.35em 0.25em"

but it should be:

style="margin: 0px 0.35em 0.25em -1.6em"

[janis-github]

Turns out that this is about "margin" token value being negative. Created PR184 for fixing that. Closing the issue in favour of PR.