Bug 25419 [Dialogs] Can't Maximize Window: "Preferences"
Build: 200210181211 The "Preferences" window cannot be maximized since it neither has a maximize title bar button nor does the title bar respond to being double-clicked. The only work around is to reside the window manually by dragging the border. For short-lived windows this is too detail-oriented and time-consuming.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
TreeItem currentSelection = tree.getSelection()[0];
		Object data = currentSelection.getData();
		if(currentSelection.getData() instanceof IPreferenceNode)
			storeValue = ((IPreferenceNode) data).getId();
	}
	
	setSelectedNodePreference(storeValue);
}
		
/**
 * Display the given error message. The currently displayed message
 * is saved and will be redisplayed when the error message is set
 * to <code>null</code>.
 *
 * @param errorMessage the errorMessage to display or <code>null</code>
 */
public void setErrorMessage(String newErrorMessage) {
	
	if (errorMessage == null ? newErrorMessage == null : errorMessage.equals(newErrorMessage))
		return;
	
	errorMessage = newErrorMessage;
	if (errorMessage == null) {
		if (showingError) {
			
			showingError = false;
			messageLabel.setBackground(normalMsgAreaBackground);
			messageLabel.setImage(null);
			titleImage.setImage(JFaceResources.getImage(PREF_DLG_TITLE_IMG));
		}