Bug 68011 [java search] "Search the JRE System Libraries" looks like a local preference but behaves as a global one... [search]
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/search/JavaSearchDescription.java
return fElementPattern;
	}
	public int getLimitTo() {
		return fLimitTo;
	}
	public String getStringPattern() {
		return fStringPattern;
	}
	public String getScopeDescription() {
		return fScopeDescription;
	}
	/**
	 * @param limitTo
	 * @param elementPattern
	 * @param stringPattern
	 * @param scopeDescription
	 */
	public JavaSearchDescription(
		int limitTo,
		IJavaElement elementPattern,
		String stringPattern,
		String scopeDescription) {
		super();
		fLimitTo= limitTo;
		fElementPattern= elementPattern;
		fStringPattern= stringPattern;
		fScopeDescription= scopeDescription;
	}
}