Hide in unified folder list if all messages are read

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

@@ -226,7 +226,8 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
 
         private void bindTo(final TupleFolderEx folder) {
             boolean disabled = isDisabled(folder);
-            boolean hide_seen = (folder.hide_seen && folder.unseen + folder.childs_unseen == 0);
+            boolean hide_seen = (account < 0 && !primary &&
+                    folder.hide_seen && folder.unseen + folder.childs_unseen == 0);
 
             int p = (show_compact && all.size() < DENSE_ITEMS_THRESHOLD ? dp3 : 0);
             view.setPadding(p, p, p, p);
@@ -1265,9 +1266,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         if (account < 0 && !primary) {
             List<TupleFolderEx> filtered = new ArrayList<>();
             for (TupleFolderEx folder : folders)
-                if (show_hidden ||
-                        !(folder.hide ||
-                                (folder.hide_seen && folder.unseen + folder.childs_unseen == 0)))
+                if (show_hidden || !folder.hide_seen || folder.unseen + folder.childs_unseen > 0)
                     filtered.add(folder);
 
             if (filtered.size() > 0)
@@ -1473,9 +1472,6 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
                 }
             }
 
-            if (parent.hide_seen && parent.unseen + parent.childs_unseen == 0 && !show_hidden)
-                continue;
-
             if (!subscribed_only ||
                     EntityFolder.INBOX.equals(parent.type) ||
                     parent.accountProtocol != EntityAccount.TYPE_IMAP ||
@@ -1533,9 +1529,6 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             while (p1 != null && p2 != null) {
                 if (p1.hide != p2.hide)
                     return false;
-                if ((p1.hide_seen && p1.unseen + p1.childs_unseen == 0) !=
-                        (p2.hide_seen && p2.unseen + p2.childs_unseen == 0))
-                    return false;
 
                 if (p1.collapsed != p2.collapsed)
                     return false;

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

@@ -2305,7 +2305,6 @@ public abstract class DB extends RoomDatabase {
                     public void migrate(@NonNull SupportSQLiteDatabase db) {
                         logMigration(startVersion, endVersion);
                         db.execSQL("ALTER TABLE `folder` ADD COLUMN `hide_seen` INTEGER NOT NULL DEFAULT 0");
-                        db.execSQL("UPDATE `folder` SET hide = 0 WHERE unified");
                     }
                 }).addMigrations(new Migration(230, 231) {
                     @Override

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

@@ -118,6 +118,18 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/cbHide" />
 
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvHideSeenHint"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="6dp"
+            android:text="@string/title_hide_seen_folder_hint"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textStyle="italic"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/cbHideSeen" />
+
         <CheckBox
             android:id="@+id/cbUnified"
             android:layout_width="wrap_content"
@@ -125,7 +137,7 @@
             android:layout_marginTop="12dp"
             android:text="@string/title_unified_folder"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@id/cbHideSeen" />
+            app:layout_constraintTop_toBottomOf="@id/tvHideSeenHint" />
 
         <CheckBox
             android:id="@+id/cbNavigation"

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

@@ -1065,6 +1065,7 @@
     <string name="title_edit_account_name">Edit account name</string>
     <string name="title_hide_folder">Hide folder</string>
     <string name="title_hide_seen_folder">Hide if all messages are read</string>
+    <string name="title_hide_seen_folder_hint">Only in the unified folder list shown on the start screen</string>
     <string name="title_unified_folder">Show in unified inbox</string>
     <string name="title_navigation_folder">Show in navigation menu</string>
     <string name="title_synchronize_folder">Synchronize (receive messages)</string>