Bug! yEd 3.19.1.1 adds spaces and line breaks to node texts

Question

Create new document. Add one node with simple text:

Save document and open it again:

The extra spaces (and line breaks) in the graphml-File:

Answer 1

While there has been a change in how text is written to XML files in Java 9's XML framework (compared to the way text was written in Java 8 and earlier), yEd has been adjusted to this change since yEd version 3.17.2.

Indeed, using yEd 3.19.1.1 with Java 11.0.2, your single node example results in the following GraphML file:

<graphml ...>
  <graph ...>
    ...
    <node id="n0">
      ...
        <y:ShapeNode>
          ...
          <y:NodeLabel ... xml:space="preserve">This is centered<y:LabelModel>...</y:ModelParameter></y:NodeLabel>
          ...
        </y:ShapeNode>
      </data>
    </node>
  </graph>
  ...
</graphml>

Note the xml:space="preserve" attribute for the <y:NodeLabel> element.