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 * Allow modules to provide a comparison about entity properties.

 *

 *

 *   - old_entity: The older entity.

 *   - new_entity: The newer entity.

 *   - view_mode: The view mode to use. Defaults to FALSE. If no view mode is

 *                given, the recommended fallback view mode is 'default'.

 *   - states: An array of view states. These could be one of:

 *     - raw: The raw value of the diff, the classic 7.x-2.x view.

 *     - rendered: The rendered HTML as determined by the view mode. Only

 *                 return markup for this state if the value is normally shown

 *                 by this view mode. The user will most likely be able to see

 *                 the raw or raw_plain state, so this is optional.

 *

 *                 The rendering state is a work in progress.

 *

 *     Conditionally, you can get these states, but setting these will override

 *     the user selectable markdown method.

 *

 *     - raw_plain: As raw, but text should be markdowned.

 *     - rendered_plain: As rendered, but text should be markdowned.

 *   This is effectively an unnested Form API-like structure.

 *

 *   States are returned as follows:

 *

 *   $results['line'] = array(

 *     '#name' => t('Line'),

 *     '#states' => array(

 *       'raw' => array(

 *         '#old' => '<p class="line">This was the old line number [tag].</p>',

 *         '#new' => '<p class="line">This is the new line [tag].</p>',

 *       ),

 *       'rendered' => array(

 *         '#old' => '<p class="line">This was the old line number <span class="line-number">57</span>.</p>',

 *         '#new' => '<p class="line">This is the new line <span class="line-number">57</span>.</p>',

 *       ),

 *     ),

 *   );

 *

 *   For backwards compatibility, no changes are required to support states,

 *   but it is recommended to provide a better UI for end users.

 *

 *   For example, the following example is equivalent to returning the raw

 *   state from the example above.

 *

 *   $results['line'] = array(

 *     '#name' => t('Line'),

 *     '#old' => '<p class="line">This was the old line number [tag].</p>',

 *     '#new' => '<p class="line">This is the new line [tag].</p>',

 *   );

  $results = array();

    $results['title'] = array(

  return $results;

function hook_entity_diff_alter(&$entity_diffs, $context) {