Added message placeholder

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

@@ -282,7 +282,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         private TextView tvPreview;
         private TextView tvError;
         private ImageButton ibHelp;
-        private ContentLoadingProgressBar pbLoading;
 
         private View vsBody;
 
@@ -400,7 +399,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             ivThread = itemView.findViewById(R.id.ivThread);
             tvError = itemView.findViewById(R.id.tvError);
             ibHelp = itemView.findViewById(R.id.ibHelp);
-            pbLoading = itemView.findViewById(R.id.pbLoading);
 
             if (tvSubject != null) {
                 tvSubject.setTextColor(colorRead);
@@ -663,15 +661,12 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             tvPreview.setVisibility(View.GONE);
             tvError.setVisibility(View.GONE);
             ibHelp.setVisibility(View.GONE);
-            pbLoading.setVisibility(View.VISIBLE);
 
             clearExpanded(null);
         }
 
         @SuppressLint("WrongConstant")
         private void bindTo(final TupleMessageEx message) {
-            pbLoading.setVisibility(View.GONE);
-
             boolean inbox = EntityFolder.INBOX.equals(message.folderType);
             boolean outbox = EntityFolder.OUTBOX.equals(message.folderType);
             boolean outgoing = isOutgoing(message);
@@ -3758,8 +3753,12 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     @Override
     public int getItemViewType(int position) {
         TupleMessageEx message = differ.getItem(position);
-        if (filter_duplicates && message != null && message.duplicate)
+        if (message == null || context == null)
+            return R.layout.item_message_placeholder;
+
+        if (filter_duplicates && message.duplicate)
             return R.layout.item_message_duplicate;
+
         return (compact ? R.layout.item_message_compact : R.layout.item_message_normal);
     }
 
@@ -4051,7 +4050,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
     @Override
     public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
         TupleMessageEx message = differ.getItem(position);
-        if (filter_duplicates && message != null && message.duplicate) {
+        if (message == null || context == null)
+            return;
+
+        if (filter_duplicates && message.duplicate) {
             holder.tvFolder.setText(context.getString(R.string.title_duplicate_in, message.getFolderName(context)));
             holder.tvFolder.setTypeface(message.unseen > 0 ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT);
             holder.tvFolder.setTextColor(message.unseen > 0 ? colorUnread : colorRead);
@@ -4060,14 +4062,9 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
         }
 
         holder.unwire();
-
-        if (message == null || context == null)
-            holder.clear();
-        else {
         holder.bindTo(message);
         holder.wire();
     }
-    }
 
     @Override
     public void onViewDetachedFromWindow(@NonNull ViewHolder holder) {

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

@@ -332,15 +332,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/tvError" />
-
-    <eu.faircode.email.ContentLoadingProgressBar
-        android:id="@+id/pbLoading"
-        style="@style/Base.Widget.AppCompat.ProgressBar"
-        android:layout_width="24dp"
-        android:layout_height="24dp"
-        android:indeterminate="true"
-        app:layout_constraintBottom_toBottomOf="@id/paddingBottom"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -325,15 +325,4 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/tvError" />
-
-    <eu.faircode.email.ContentLoadingProgressBar
-        android:id="@+id/pbLoading"
-        style="@style/Base.Widget.AppCompat.ProgressBar"
-        android:layout_width="24dp"
-        android:layout_height="24dp"
-        android:indeterminate="true"
-        app:layout_constraintBottom_toBottomOf="@id/paddingBottom"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>

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

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:padding="6dp"
+        android:text="@string/title_loading"
+        android:textAppearance="@style/TextAppearance.AppCompat.Small"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -871,6 +871,7 @@
     <string name="title_minutes">Minutes</string>
     <string name="title_dismiss">Dismiss</string>
     <string name="title_snooze_now">Snooze</string>
+    <string name="title_loading">Loading &#8230;</string>
 
     <string name="title_icalendar_accept">Accept</string>
     <string name="title_icalendar_decline">Decline</string>