Remove viewport limitations

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

@@ -1839,10 +1839,50 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         }
 
         private void onShowFull(TupleMessageEx message) {
+            Bundle args = new Bundle();
+            args.putLong("id", message.id);
+
+            new SimpleTask<String>() {
+                @Override
+                protected String onExecute(Context context, Bundle args) {
+                    long id = args.getLong("id");
+
+                    String html = properties.getHtml(id);
+
+                    // Remove viewport limitations
+                    Document doc = Jsoup.parse(html);
+                    for (Element meta : doc.select("meta").select("[name=viewport]")) {
+                        String content = meta.attr("content");
+                        String[] params = content.split(";");
+                        if (params.length > 0) {
+                            List<String> viewport = new ArrayList<>();
+                            for (String param : params)
+                                if (!param.toLowerCase().contains("maximum-scale") &&
+                                        !param.toLowerCase().contains("user-scalable"))
+                                    viewport.add(param.trim());
+
+                            if (viewport.size() == 0)
+                                meta.attr("content", "");
+                            else
+                                meta.attr("content", TextUtils.join(" ;", viewport) + ";");
+                        }
+                    }
+
+                    return doc.html();
+                }
+
+                @Override
+                protected void onExecuted(Bundle args, String html) {
+                    long id = args.getLong("id");
+
+                    TupleMessageEx amessage = getMessage();
+                    if (amessage == null || !amessage.id.equals(id))
+                        return;
+
                     WebView webView = new WebView(context);
                     setupWebView(webView);
 
-            boolean show_images = properties.getValue("images", message.id);
+                    boolean show_images = properties.getValue("images", id);
 
                     WebSettings settings = webView.getSettings();
                     settings.setDefaultFontSize(Math.round(textSize));
@@ -1851,7 +1891,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     settings.setBuiltInZoomControls(true);
                     settings.setDisplayZoomControls(false);
 
-            String html = properties.getHtml(message.id);
                     webView.loadDataWithBaseURL("", html, "text/html", "UTF-8", null);
 
                     final Dialog dialog = new Dialog(context, android.R.style.Theme_Black_NoTitleBar_Fullscreen);
@@ -1870,6 +1909,13 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     });
                 }
 
+                @Override
+                protected void onException(Bundle args, Throwable ex) {
+                    Helper.unexpectedError(context, owner, ex);
+                }
+            }.execute(context, owner, args, "message:full");
+        }
+
         private void setupWebView(WebView webView) {
             webView.setWebViewClient(new WebViewClient() {
                 public boolean shouldOverrideUrlLoading(WebView view, String url) {