Bug 156469 Should not new a file that is not a *.properties on resource file
Desctiption: Should not create a file that is not a *.properties on resource file when the resource folder has not any other *.properties Step: 1.Set the resource folder path is blank. 2.New a report project. 3.New a report design. 4.Click the blank area on layout. 5.Select Property Editor - General - Resources 6.Click Add to add a resource file. 7.The browse resource file is pop up and select Resource Folder. 8.Input any word in text field. Excepted result: It prompt that the file name must end with .properties Actual result: Click OK and the file is create.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/resource/ResourceSelectionValidator.java
* @param multiSelect
	 *            allow multi select.
	 * @param acceptFolders
	 *            allow select folder as result.
	 * @param ext
	 *            file extension to filter.
	 */
	public ResourceSelectionValidator( boolean multiSelect,
			boolean acceptFolders, String[] ext )
	{
		this.multiSelect = multiSelect;
		this.acceptFolders = acceptFolders;
		this.ext = ext;
		if ( ext != null )
		{
			extWrongMessage = Messages.getString( "ResourceSelectionValidator.ExtError" ); 
			for ( int i = 0; i < ext.length; i++ )
			{
				if ( i > 0 )
				{
					extWrongMessage += Messages.getString( "ResourceSelectionValidator.ExtErrorSplitter" ); 
				}
				extWrongMessage += ext[i];
			}
		}
	}
	/**
	 * Constructor. This constructor create a validator which not allow mulit
	 * select, not allow folder selection.
	 */