void (boolean useFileNestingRules) { if (project.isDisposed()) return; boolean updated = useFileNestingRules != currentState.getUseFileNestingRules(); currentState.setUseFileNestingRules(useFileNestingRules); getDefaultState().setUseFileNestingRules(useFileNestingRules); if (updated) updatePanes(false); }