Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
if ( c == '\'' || c == '\"' )
				{
					if ( bracket.empty( ) )
					{
						bracket.add( new Character( c ) );
					}
					else
					{
						if ( ( (Character) bracket.peek( ) ).charValue( ) == c )
						{
							bracket.pop( );
							bidiStart = false;
						}
						else
						{
							bracket.add( new Character( c ) );
						}
					}
				}
				level[i] = bidiStart && !bracket.empty( ) ? 1 : 0;
			}
			else
			{
				level[i] = bidi.getLevelAt( i );
				if ( level[i] % 2 == 1 )
				{
					bidiStart = true;
				}
			}
		}