Bug 123989 Should ResourceChangeValidator#validateChange take a progress monitor
Since the validation might take some time it might make sense to pass a progress monitor into validateChange.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/ide/IDE.java
return page.openEditor(new FileEditorInput(input), editorId, activate);
    }
    /**
	 * Returns an editor descriptor appropriate for opening the given file
	 * resource.  
	 * <p>
	 * The editor descriptor is determined using a multistep process. This
	 * method will attempt to resolve the editor based on content-type bindings
	 * as well as traditional name/extension bindings.
	 * </p>
	 * <ol>
	 * <li>The file is consulted for a persistent property named
	 * <code>IDE.EDITOR_KEY</code> containing the preferred editor id to be
	 * used.</li>
	 * <li>The workbench editor registry is consulted to determine if an editor
	 * extension has been registered for the file type. If so, an instance of
	 * the editor extension is opened on the file. See
	 * <code>IEditorRegistry.getDefaultEditor(String)</code>.</li>
	 * <li>The operating system is consulted to determine if an in-place
	 * component editor is available (e.g. OLE editor on Win32 platforms).</li>
	 * <li>The operating system is consulted to determine if an external editor
	 * is available.</li>
	 * </ol>
	 * </p>
	 * 
	 * @param file
	 *            the file
	 * @return an editor descriptor, appropriate for opening the file
	 * @throws PartInitException
	 *             if no editor can be found