Accessibility: Media: Hide the invisible "file upload button" on media views from assistive technologies.

The button is visually hidden, but was announced by screen readers in workflows unrelated to file uploading, leading to confusion.

Props afercia, audrasjb, azaozz.
Fixes #47611.
Built from https://develop.svn.wordpress.org/trunk@47375


git-svn-id: http://core.svn.wordpress.org/trunk@47162 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/css/media-views-rtl.css

@@ -1527,6 +1527,11 @@
 	display: inline-block !important;
 }
 
+div.moxie-shim.moxie-shim-html5,
+div.moxie-shim.moxie-shim-html5 input[type="file"] {
+	display: none;
+}
+
 /**
  * Selection
  */

wp-includes/css/media-views.css

@@ -1526,6 +1526,11 @@
 	display: inline-block !important;
 }
 
+div.moxie-shim.moxie-shim-html5,
+div.moxie-shim.moxie-shim-html5 input[type="file"] {
+	display: none;
+}
+
 /**
  * Selection
  */

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-beta2-47374';
+$wp_version = '5.4-beta2-47375';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.