Set transient state on expand only

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

@@ -247,8 +247,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
             tvBody.setMovementMethod(new UrlHandler());
 
-            if (viewType == ViewType.THREAD)
-                itemView.setHasTransientState(true);
         }
 
         private void wire() {
@@ -313,6 +311,20 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             boolean show_addresses = properties.showAddresses(message.id);
             boolean show_headers = properties.showHeaders(message.id);
 
+            if (viewType == ViewType.THREAD) {
+                if (show_expanded) {
+                    if (!properties.isFrozen(message.id)) {
+                        itemView.setHasTransientState(true);
+                        properties.setFrozen(message.id, true);
+                    }
+                } else {
+                    if (properties.isFrozen(message.id)) {
+                        itemView.setHasTransientState(false);
+                        properties.setFrozen(message.id, false);
+                    }
+                }
+            }
+
             pbLoading.setVisibility(View.GONE);
 
             if (viewType == ViewType.THREAD) {
@@ -1664,6 +1676,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     interface IProperties {
         void setExpanded(long id, boolean expand);
 
+        void setFrozen(long id, boolean freeze);
+
         void setAddresses(long id, boolean show);
 
         void setHeaders(long id, boolean show);
@@ -1672,6 +1686,8 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
         boolean isExpanded(long id);
 
+        boolean isFrozen(long id);
+
         boolean showAddresses(long id);
 
         boolean showHeaders(long id);

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

@@ -117,6 +117,7 @@ public class FragmentMessages extends FragmentEx {
     private int autoCloseCount = 0;
     private boolean autoExpand = true;
     private List<Long> expanded = new ArrayList<>();
+    private List<Long> frozen = new ArrayList<>();
     private List<Long> addresses = new ArrayList<>();
     private List<Long> headers = new ArrayList<>();
     private List<Long> images = new ArrayList<>();
@@ -310,6 +311,15 @@ public class FragmentMessages extends FragmentEx {
                             expanded.remove(id);
                     }
 
+                    @Override
+                    public void setFrozen(long id, boolean freeze) {
+                        Log.i(Helper.TAG, "Freeze=" + freeze + " id=" + id);
+                        if (freeze)
+                            frozen.add(id);
+                        else
+                            frozen.remove(id);
+                    }
+
                     @Override
                     public void setAddresses(long id, boolean show) {
                         if (show)
@@ -339,6 +349,11 @@ public class FragmentMessages extends FragmentEx {
                         return expanded.contains(id);
                     }
 
+                    @Override
+                    public boolean isFrozen(long id) {
+                        return frozen.contains(id);
+                    }
+
                     @Override
                     public boolean showAddresses(long id) {
                         return !addresses.contains(id);