Ticket #38511: 38511.4.patch

src/wp-includes/js/mce-view.js

@@ -511 +511 @@
                                         }, '\u200B' );
                                 }
 
+                                // For Firefox, do this here to make sure there's a selection so it's a noop later.
+                                editor.quirks.refreshContentEditable();
+
                                 // Seems the browsers need a bit of time to insert/set the view nodes,
                                 // or the iframe will fail especially when switching Text => Visual.
                                 setTimeout( function() {

src/wp-includes/js/tinymce/plugins/wpview/plugin.js

@@ -132 +132 @@
 
                                 if ( /^https?:\/\/\S+$/i.test( content ) ) {
                                         event.content = content;
+                                } else {
+                                        // Firefox prettyprints text/html into the clipboard, inserting newlines to wrap long lines.
+                                        // This messes up shortcodes with attributes (they get autoped and won't parse), so remove them.
+                                        var match;
+                                        if ( content.indexOf( '\u000a' ) !== -1 && ( match = /^\[[^\]]+?\]/.exec( content ) ) !== null ) {
+                                                event.content = match[0].replace( /\u000a/g, '' ) + content.slice( match[0].length );
+                                        }
                                 }
                         }
                 } );