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
messageLabel.setToolTipText(errorMessage);
			if (!showingError) {
				
				showingError = true;
				
				if (errorMsgAreaBackground == null) {
					errorMsgAreaBackground =
						JFaceColors.getErrorBackground(messageLabel.getDisplay());
					errorMsgImage = JFaceResources.getImage(PREF_DLG_IMG_TITLE_ERROR);
				}
					
				normalMsgAreaBackground = messageLabel.getBackground();
				messageLabel.setBackground(errorMsgAreaBackground);
				messageLabel.setImage(errorMsgImage);
				titleImage.setImage(null);
			}
		}
		titleArea.layout(true);
	}
	/**
	 * Sets whether a Help button is available for this dialog.
	 * <p>
	 * Clients must call this framework method before the dialog's control
	 * has been created.
	 * <p>
	 *
	 * @param b <code>true</code> to include a Help button, 
	 *  and <code>false</code> to not include one (the default)
	 */
	public void setHelpAvailable(boolean b) {