Bug 41523 Keep Order of libs when editing library [build path]
When I edit a library in the Properties dialog of my project using "Properties"->"Java Build Path"->"Libraries"->"Edit", e.g. changing the JRE from 1.4 to 1.3, or changing from an old version of a JAR to a newer one, the changed library is at the last position in the classpath. It should kept at the position it was.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/SourceContainerWorkbookPage.java
public void dialogFieldChanged(DialogField field) {
			sourcePageDialogFieldChanged(field);
		}
	}
	
	protected void sourcePageKeyPressed(TreeListDialogField field, KeyEvent event) {
		if (field == fFoldersList) {
			if (event.character == SWT.DEL && event.stateMask == 0) {
				List selection= field.getSelectedElements();
				if (canRemove(selection)) {
					removeEntry();
				}
			}
		}	
	}	
	
	protected void sourcePageDoubleClicked(TreeListDialogField field) {
		if (field == fFoldersList) {
			List selection= field.getSelectedElements();
			if (canEdit(selection)) {
				editEntry();
			}
		}
	}
	
	protected void sourcePageCustomButtonPressed(DialogField field, int index) {
		if (field == fFoldersList) {
			if (index == IDX_ADD) {
				List elementsToAdd= new ArrayList(10);
				if (fCurrJProject.getProject().exists()) {