Bug 120544 [build path] Editing external source folder does not persist
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/BuildPathsBlock.java
}
	}
	protected void doUpdateUI() {
		fBuildPathDialogField.refresh();
		fClassPathList.refresh();
	
		if (fSourceContainerPage != null) {
			fSourceContainerPage.init(fCurrJProject);
			fProjectsPage.init(fCurrJProject);
			fLibrariesPage.init(fCurrJProject);
		}
		doStatusLineUpdate();
	}
	
	private String getEncodedSettings() {
		StringBuffer buf= new StringBuffer();	
		CPListElement.appendEncodePath(fOutputLocationPath, buf).append(';');
		int nElements= fClassPathList.getSize();
		buf.append('[').append(nElements).append(']');
		for (int i= 0; i < nElements; i++) {
			CPListElement elem= (CPListElement) fClassPathList.getElement(i);
			elem.appendEncodedSettings(buf);
		}
		return buf.toString();
	}
	
	public boolean hasChangesInDialog() {
		String currSettings= getEncodedSettings();
		return !currSettings.equals(fUserSettingsTimeStamp);
	}