Bug 136807 [Regression]Preview embedded image with web view will effect other way to preview
Details: [Regression]Preview embedded image with web view will effect other way to preview Step: 1.New a library and insert a embedded image. 2.New a report design and use the library. 3.Drop the image form library into layout. 4.Preview with HTML/PDF. 5.Preview with web view. 6.Preview with HTML/PDF. Actual result: In step 4, image is previewed. In step 5, image can't be previewed. In step 6, image can't be previewed. It means that, after I use web view to preview the embedded image from library, I can't preview this image any ways.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/content/impl/ImageContent.java
* set the MIME type
	 * 
	 * @param MIMEType -
	 *            the MIMEType
	 */
	public void setMIMEType( String MIMEType )
	{
		this.MIMEType = MIMEType;
	}
	/**
	 * get the MIMEType
	 */
	public String getMIMEType( )
	{
		return MIMEType;
	}
	public String getExpression( )
	{
		if ( generateBy instanceof ImageItemDesign )
		{
			return ( (ImageItemDesign) generateBy ).getImageExpression( );
		}
		return null;
	}
	static final protected int FIELD_ALTTEXT = 500;
	static final protected int FIELD_ALTTEXTKEY = 501;
	static final protected int FIELD_EXTENSEION = 502;
	static final protected int FIELD_URI = 503;
	static final protected int FIELD_SOURCETYPE = 504;
	static final protected int FIELD_IMAGEMAP = 505;