Add image previews in HTML messages

harmonyqml/components/chat/MessageContent.qml

@@ -39,7 +39,7 @@ Row {
             //      (isOwn ? "  " + content : "")
 
             text: (dict.formatted_body ?
-                   Backend.htmlFilter.sanitize(dict.formatted_body) :
+                   Backend.htmlFilter.filter(dict.formatted_body) :
                    dict.body) +
                   "&nbsp;&nbsp;<font size=" + smallSize + "px color=gray>" +
                   Qt.formatDateTime(date_time, "hh:mm:ss") +

harmonyqml/components/chat/MessageList.qml

@@ -20,5 +20,9 @@ Rectangle {
         clip: true
         topMargin: space
         bottomMargin: space
+
+        // Keep x scroll pages cached, to limit images having to be
+        // reloaded from network.
+        cacheBuffer: height * 6
     }
 }