Code Modernization: Declare dynamic properties on WP_Text_Diff_Renderer_Table.

Core uses 3 known, named, dynamic properties on the `WP_Text_Diff_Renderer_Table` class:

* `_title`
* `_title_left`
* `_title_right`

When reviewing revisions (within the admin UI), `wp_text_diff()` passes the arguments (without the leading `_`) to a new instance, which raised deprecation notices (see [56354]).

Note: the parent class adds the leading `_` to each of these properties (see [7747]).

The deprecation notices are resolved by declaring each of these known, named, dynamic properties on the class, per the #56034 mitigation strategy. These new properties are not initialized to retain their previous `null` behavior.

Follow-up to [56354], [23506], [7747].

Props wildworks, antonvlasenko, hellofromTonya, ironprogrammer, kafleg, mukesh27, nicolefurlan, presskopp, sabernhardt.
Fixes #59431.
See #58898, #56034.
Built from https://develop.svn.wordpress.org/trunk@56938


git-svn-id: http://core.svn.wordpress.org/trunk@56449 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-text-diff-renderer-table.php

@@ -30,6 +30,30 @@ class WP_Text_Diff_Renderer_Table extends Text_Diff_Renderer {
 	 */
 	public $_trailing_context_lines = 10000;
 
+	/**
+	 * Title of the item being compared.
+	 *
+	 * @since 6.4.0 Declared a previously dynamic property.
+	 * @var string|null
+	 */
+	public $_title;
+
+	/**
+	 * Title for the left column.
+	 *
+	 * @since 6.4.0 Declared a previously dynamic property.
+	 * @var string|null
+	 */
+	public $_title_left;
+
+	/**
+	 * Title for the right column.
+	 *
+	 * @since 6.4.0 Declared a previously dynamic property.
+	 * @var string|null
+	 */
+	public $_title_right;
+
 	/**
 	 * Threshold for when a diff should be saved or omitted.
 	 *

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-beta4-56937';
+$wp_version = '6.4-beta4-56938';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.