title: Make edges not clickable in Roassal visualization from within a Glamour browser
body: <p>I draw a dynamic callgraph with Roassal from within a Glamour browser in Pharo 2.0.</p>
  
  <p>By default not only the nodes, but also the edges are clickable.</p>
  
  <p>As i have no further information to display for the edges, i want them not to be clickable. How do i remove the "clickability"?</p>
  
  <p>That's how i draw the callgraph from within a Glamour browser:</p>
  
  <pre><code>methodsUnderTestAsCallGraphIn: constructor
      constructor roassal
          painting: [ :view :testFailure | 
                      view shape rectangle
                          size: 30;
                          fillColor: ThreeColorLinearNormalizer new.
                      view nodes: (tests methodsUnderTest: testFailure).
                      view shape arrowedLine.
                      view edges: (tests methodsUnderTest: testFailure) from: #yourself toAll: #outgoingCalls.
                      view treeLayout ];
          title: 'Callgraph of methods under test'
  </code></pre>
  
  <p>I think GLMRoassalPresentation>>renderOn: is responsible for adding the "clickability":</p>
  
  <pre><code>[...]
  
      self shouldPopulateSelection ifTrue: [   
          aView raw allElementsDo: [:each | 
              each on: ROMouseClick do: [:event | self selection: each model ]] ].
  
  [...]
  </code></pre>
  
  <p>I want to to keep this behaviour for the nodes, but not for the edges.</p>