Replaced icons

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

@@ -1727,7 +1727,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
                     boolean button_rule = prefs.getBoolean("button_rule", false);
                     boolean button_extra = prefs.getBoolean("button_extra", false);
 
-                    ibSeen.setImageResource(message.ui_seen ? R.drawable.twotone_visibility_off_24 : R.drawable.twotone_visibility_24);
+                    ibSeen.setImageResource(message.ui_seen ? R.drawable.twotone_mail_24 : R.drawable.twotone_drafts_24);
                     ibTrash.setTag(delete);
 
                     ibUndo.setVisibility(outbox ? View.VISIBLE : View.GONE);

app/src/main/res/layout/include_message_navigation.xml

@@ -185,7 +185,7 @@
         android:padding="6dp"
         android:scaleType="fitCenter"
         android:tooltipText="@string/title_toggle_seen"
-        app:srcCompat="@drawable/twotone_visibility_24"
+        app:srcCompat="@drawable/twotone_mail_24"
         tools:ignore="MissingConstraints" />
 
     <ImageButton