Themes: Force a scrollbar on the Themes page to prevent visual shake on hover.

On some browser & window size combinations (near where a scrollbar would appear), hovering over the theme card causes a layout shift. This makes the screen visually "jump" as the scrollbar appears and disappears. By forcing the scrollbar to be visible on this page, hovering doesn't cause the layout shift anymore.

Props wparslan, sabernhardt, costdev, audrasjb.
Fixes #53478.


Built from https://develop.svn.wordpress.org/trunk@52185


git-svn-id: http://core.svn.wordpress.org/trunk@51777 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/css/themes-rtl.css

@@ -8,6 +8,10 @@
   16.1 - Manage Themes
 ------------------------------------------------------------------------------*/
 
+.themes-php {
+	overflow-y: scroll;
+}
+
 body.js .theme-browser.search-loading {
 	display: none;
 }

wp-admin/css/themes.css

@@ -7,6 +7,10 @@
   16.1 - Manage Themes
 ------------------------------------------------------------------------------*/
 
+.themes-php {
+	overflow-y: scroll;
+}
+
 body.js .theme-browser.search-loading {
 	display: none;
 }

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52184';
+$wp_version = '5.9-alpha-52185';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.