Fix libzim message handler to enable popovers and fix erratic sliding toolbars (fixes #1385, #1380)

www/js/app.js

@@ -1101,6 +1101,11 @@ function handleMessageChannelByLibzim (event) {
             messagePort.postMessage({ action: 'giveContent', title: title, content: '' });
             return;
         }
+        // Update appstate for HTML content to ensure popovers work correctly
+        if (/\bx?html/i.test(ret.mimetype)) {
+            appstate.baseUrl = encodeURI(title.replace(/[^/]+$/, ''));
+            appstate.expectedArticleURLToBeDisplayed = title;
+        }
         // Let's send the content to the ServiceWorker
         const message = { action: 'giveContent', title: title, content: ret.content, mimetype: ret.mimetype };
         messagePort.postMessage(message);