Bug 57762 [Dialogs] honor the platform button dismissal alignment on Mac and GTK
Button ordering is inverted on these platforms. See Display.getDismissalAlignment() or the equivalent JFace mechansim.
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
return 0;
		}
		return convertVerticalDLUsToPixels(fontMetrics, dlus);
	}
	/**
	 * Returns the number of pixels corresponding to the width of the given
	 * number of characters.
	 * <p>
	 * This method may only be called after <code>initializeDialogUnits</code>
	 * has been called.
	 * </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