Added namespace fail safe

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -1584,7 +1584,8 @@ public class HtmlHelper {
         for (Element e : parsed.select("*")) {
             String tag = e.tagName();
             if (tag.contains(":")) {
-                boolean show = ("body".equals(tag) || ns == null || tag.startsWith(ns));
+                boolean show = (ns == null || tag.startsWith(ns) ||
+                        tag.startsWith("html:") || tag.startsWith("body:"));
                 if (display_hidden || show) {
                     String[] nstag = tag.split(":");
                     e.tagName(nstag[nstag.length > 1 ? 1 : 0]);
@@ -1598,8 +1599,7 @@ public class HtmlHelper {
                     e.remove();
                     Log.i("Removed tag=" + tag);
                 }
-            }
-
+            } else if (!"html".equals(tag) && !"body".equals(tag)) {
                 String xmlns = e.attr("xmlns").toLowerCase(Locale.ROOT);
                 if (!TextUtils.isEmpty(xmlns) && !xmlns.contains(W3NS)) {
                     if (display_hidden) {
@@ -1612,6 +1612,7 @@ public class HtmlHelper {
                 }
             }
         }
+    }
 
     static List<CSSStyleSheet> parseStyles(Elements styles) {
         List<CSSStyleSheet> sheets = new ArrayList<>();