Ticket #31297: 31297.2.diff

src/wp-admin/js/editor.js

@@ -195 +195 @@
                         html = html.replace( /^\s+/, '' );
                         html = html.replace( /[\s\u00a0]+$/, '' );
 
+                        // Convert non-breaking spaces to HTML entities
+                        html = html.replace( /\u00a0/g, ' ' );
+
                         // put back the line breaks in pre|script
                         if ( preserve_linebreaks ) {
                                 html = html.replace( /<wp-line-break>/g, '\n' );