Added open tracking link when showing images

Always requires confirmation

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

@@ -647,6 +647,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                                 ImageSpan[] image = buffer.getSpans(off, off, ImageSpan.class);
                                 if (image.length > 0 && image[0].getSource() != null) {
                                     Uri uri = Uri.parse(image[0].getSource());
+
                                     if (UriHelper.isHyperLink(uri)) {
                                         ripple(event);
                                         if (onOpenLink(uri, null,
@@ -675,10 +676,13 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                             }
 
                             ImageSpan[] image = buffer.getSpans(off, off, ImageSpan.class);
-                            if (image.length > 0) {
+                            if (image.length > 0 && image[0] instanceof ImageSpanEx) {
-                                if (image[0] instanceof ImageSpanEx &&
+                                String tracking = ((ImageSpanEx) image[0]).getTracking();
-                                        ((ImageSpanEx) image[0]).getTracking())
+                                if (!TextUtils.isEmpty(tracking)) {
+                                    onOpenLink(Uri.parse(tracking),
+                                            context.getString(R.string.title_legend_tracking_pixel), true);
                                     return true;
+                                }
 
                                 ripple(event);
                                 onOpenImage(message.id, image[0].getSource(),

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

@@ -30,7 +30,7 @@ import org.jsoup.nodes.Element;
 public class ImageSpanEx extends ImageSpan {
     private final int width;
     private final int height;
-    private final boolean tracking;
+    private final String tracking;
 
     public ImageSpanEx(@NonNull Drawable drawable, @NonNull Element img) {
         super(drawable, img.attr("src"));
@@ -60,7 +60,7 @@ public class ImageSpanEx extends ImageSpan {
 
         this.width = _width;
         this.height = _height;
-        this.tracking = !TextUtils.isEmpty(img.attr("x-tracking"));
+        this.tracking = img.attr("x-tracking");
     }
 
     public int getWidth() {
@@ -71,7 +71,7 @@ public class ImageSpanEx extends ImageSpan {
         return this.height;
     }
 
-    public boolean getTracking() {
+    public String getTracking() {
         return this.tracking;
     }
 }