Bug 38462 [Dialogs] Tree in Preference & Properties dialog should be resizable
I20030604 On MacOS X the native tree isn't as compact as on other platforms. As a result some of the tree items in the Preference and Properties dialogs are barely visible. Since horizontalls scrolling is cumbersome, it would be nice to have a sash between the tree and the dialog's content. Remembering the dialog's size and the sash position would be helpful, too.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
/**
	 * 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));
			}
			 
			
			if (message == null)
				
				message = ""; 
			messageLabel.setText(message);
			messageLabel.setImage(messageImage);
			messageLabel.setToolTipText(message);
		} else {
			messageLabel.setText(errorMessage);