When trying to open the customize perspective dialog, either, by right clicking on the perspective icon and selecting “Customize” or by invoking the equivalent action through the menu, I get an error:
Error executing ‘org.eclipse.ui.window.customizePerspective’: java.lang.NullPointerException: Cannot invoke “String.split(String)” because “elementId” is null
I have reported the issue in the Eclipse Platform project, but I believe the problem is in DevStyle.