Bug 126527 [Field Assist] - API - Field Decoration alignment issues are different for cell editors
bundles/org.eclipse.jface/src/org/eclipse/jface/fieldassist/DecoratedTextCellEditor.java
*/
	public void performDelete() {
		if (text.getSelectionCount() > 0)
			
			text.insert(""); 
		else {
			
			int pos = text.getCaretPosition();
			if (pos < text.getCharCount()) {
				text.setSelection(pos, pos + 1);
				text.insert(""); 
			}
		}
		checkSelection();
		checkDeleteable();
		checkSelectable();
	}
	/**
	 * The <code>TextCellEditor</code> implementation of this
	 * <code>CellEditor</code> method pastes the the clipboard contents over
	 * the current selection.
	 */
	public void performPaste() {
		text.paste();
		checkSelection();
		checkDeleteable();
		checkSelectable();
	}
	/**
	 * The <code>TextCellEditor</code> implementation of this