Ticket #42193: 42193.1.patch

src/wp-admin/js/common.js

@@ -307 +307 @@
                 $sortables = $('.meta-box-sortables'),
                 wpResponsiveActive = false,
                 $adminbar = $( '#wpadminbar' ),
+                adminReadonlyTextarea = $( '.wp-admin textarea' ),
                 lastScrollPosition = 0,
                 pinnedMenuTop = false,
                 pinnedMenuBottom = false,
@@ -327 +328 @@
                 $(e.target).parent().siblings('a').get(0).click();
         });
 
+        // Adds a copy to clipboard button after a read-only textarea.
+        if ( adminReadonlyTextarea.is( '[readonly]' ) ) {
+                adminReadonlyTextarea.after( '<br><input type="button" value="Copy to Clipboard" class="button btn-copy-to-clipboard"/>' );
+
+                var copyButton   = $( '.btn-copy-to-clipboard' );
+
+                copyButton.on( 'click', function() {
+                        var textareaSibling = $( this ).siblings( 'textarea' );
+                        textareaSibling.select();
+                        document.execCommand( 'copy' );
+                })
+        }
+
         $( '#collapse-button' ).on( 'click.collapse-menu', function() {
                 var viewportWidth = getViewportWidth() || 961;