* Overridden to handle backspace (will only be called on Eclipse 3.5)
*/
@Override
protected SourceViewer createSourceViewer(Composite parent, int textOrientation) {
final SourceViewer viewer = super.createSourceViewer(parent, textOrientation);
viewer.appendVerifyKeyListener(PyPeerLinker.createVerifyKeyListener(viewer));
viewer.appendVerifyKeyListener(PyBackspace.createVerifyKeyListener(viewer, null));
IWorkbenchPart workbenchPart = getCompareConfiguration().getContainer().getWorkbenchPart();
//Note that any site should be OK as it's just to know if a keybinding is active.
IWorkbenchPartSite site = null;