Bug 73729 [Workbench] [Mac] Dual preferences menu items
On Mac OS X, the preferences menu item appears in the Eclipse menu. This is correct. However, the same menu item that does the same thing also appears in the Window menu, which is correct on other platforms but not the Mac. It should be removed from the Window menu.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/WorkbenchActionBuilder.java
* 
     * @param infos the infos
     * @return <code>true</code> if a welcome page was found, <code>false</code> if not
     */
    private boolean hasWelcomePage(AboutInfo[] infos) {
        for (int i = 0; i < infos.length; i++) {
            if (infos[i].getWelcomePageURL() != null) {
            	return true;
            }
        }
        return false;
	}
    /**
     * Returns whether any of the given infos have tips and tricks.
     * 
     * @param infos the infos
     * @return <code>true</code> if tips and tricks were found, <code>false</code> if not
     */
    private boolean hasTipsAndTricks(AboutInfo[] infos) {
        for (int i = 0; i < infos.length; i++) {
            if (infos[i].getTipsAndTricksHref() != null) {
            	return true;
            }
        }
        return false;
	}
	/**
	 * Update the build actions on the toolbar and menu bar based on the current
	 * state of autobuild. This method can be called from any thread.
	 *