Bug 137315 [Dialogs] Doubleclickable area to restore dialog size is often very small
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* </p>
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 * 
	 * @param chars
	 *            the number of characters
	 * @return the number of pixels
	 */
	protected int convertWidthInCharsToPixels(int chars) {
		
		if (fontMetrics == null) {
			return 0;
		}
		return convertWidthInCharsToPixels(fontMetrics, chars);
	}
	/**
	 * Creates a new button with the given id.
	 * <p>
	 * The <code>Dialog</code> implementation of this framework method creates
	 * a standard push button, registers it for selection events including
	 * button presses, and registers default buttons with its shell. The button
	 * id is stored as the button's client data. If the button id is
	 * <code>IDialogConstants.CANCEL_ID</code>, the new button will be
	 * accessible from <code>getCancelButton()</code>. If the button id is
	 * <code>IDialogConstants.OK_ID</code>, the new button will be accesible
	 * from <code>getOKButton()</code>. Note that the parent's layout is
	 * assumed to be a <code>GridLayout</code> and the number of columns in
	 * this layout is incremented. Subclasses may override.
	 * </p>