Links with heterogeneous inner styles are not entirely clickable

[slauriere]

Steps to reproduce

Environment: Diagram Pro 1.12, XWiki Standard 10.11.9, Firefox 71

• Create a diagram
• Insert a rectangle with some inner sentence
• Add an hyperlink to the text toward an internal wiki page
• Style only a part of the sentence (for example turn one word to bold face in the middle of the sentence)
• Save and view the diagram
• Click the bold word

Result

The link does not open while one would expect it does. The other parts of the sentence remain clickable.

Sample diagram

Here's below the XML of a sample diagram producing the error.

<mxGraphModel dx="686" dy="497" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="827" pageHeight="1169" math="0" shadow="0">
  <root>
    <mxCell id="v0DjpAL3hPdHT3A4eaxT-0"/>
    <mxCell id="v0DjpAL3hPdHT3A4eaxT-1" parent="v0DjpAL3hPdHT3A4eaxT-0"/>
    <mxCell id="IT_YH68JLBqi0NF2uO0P-2" value="&lt;a href=&quot;data:xwiki/reference,doc:xwiki:Sandbox.WebHome&quot;&gt;Lorem ipsum dolor &lt;b&gt;sic&lt;/b&gt; amor&lt;/a&gt;" style="rounded=0;whiteSpace=wrap;html=1;" parent="v0DjpAL3hPdHT3A4eaxT-1" vertex="1">
      <mxGeometry x="190" y="160" width="120" height="60" as="geometry"/>
    </mxCell>
  </root>
</mxGraphModel>