Prevent viewing tracking icon

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

@@ -4507,8 +4507,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
                     ImageSpan[] image = buffer.getSpans(off, off, ImageSpan.class);
                     if (image.length > 0) {
-                        String source = image[0].getSource();
+                        ImageHelper.AnnotatedSource a = new ImageHelper.AnnotatedSource(image[0].getSource());
+                        String source = a.getSource();
                         if (!TextUtils.isEmpty(source)) {
+                            if (!a.isTracking())
                                 onOpenImage(message.id, source);
                             return true;
                         }

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

@@ -881,6 +881,10 @@ class ImageHelper {
             return this.source;
         }
 
+        public boolean isTracking() {
+            return this.tracking;
+        }
+
         String getAnnotated() {
             return (width == 0 && height == 0
                     ? source