Prevent invalidation of paged messages by folder updates

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

@@ -54,7 +54,7 @@ import io.requery.android.database.sqlite.RequerySQLiteOpenHelperFactory;
 // https://developer.android.com/topic/libraries/architecture/room.html
 
 @Database(
-        version = 85,
+        version = 86,
         entities = {
                 EntityIdentity.class,
                 EntityAccount.class,
@@ -66,6 +66,9 @@ import io.requery.android.database.sqlite.RequerySQLiteOpenHelperFactory;
                 EntityAnswer.class,
                 EntityRule.class,
                 EntityLog.class
+        },
+        views = {
+                EntityFolderView.class
         }
 )
 
@@ -852,6 +855,13 @@ public abstract class DB extends RoomDatabase {
                         db.execSQL("UPDATE attachment SET size = NULL WHERE size = 0");
                     }
                 })
+                .addMigrations(new Migration(85, 86) {
+                    @Override
+                    public void migrate(SupportSQLiteDatabase db) {
+                        Log.i("DB migration from version " + startVersion + " to " + endVersion);
+                        db.execSQL("CREATE VIEW `folderview` AS SELECT id, account, name, type, display, unified FROM folder");
+                    }
+                })
                 .build();
     }
 

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

@@ -56,7 +56,7 @@ public interface DaoMessage {
             " FROM message" +
             " JOIN account ON account.id = message.account" +
             " LEFT JOIN identity ON identity.id = message.identity" +
-            " JOIN folder ON folder.id = message.folder" +
+            " JOIN folderview AS folder ON folder.id = message.folder" +
             " WHERE account.`synchronize`" +
             " AND (NOT message.ui_hide OR :debug)" +
             " AND (NOT :found OR ui_found = :found)" +
@@ -102,8 +102,8 @@ public interface DaoMessage {
             " FROM message" +
             " JOIN account ON account.id = message.account" +
             " LEFT JOIN identity ON identity.id = message.identity" +
-            " JOIN folder ON folder.id = message.folder" +
-            " JOIN folder f ON f.id = :folder" +
+            " JOIN folderview AS folder ON folder.id = message.folder" +
+            " JOIN folderview f ON f.id = :folder" +
             " WHERE (message.account = f.account OR " + is_outbox + ")" +
             " AND (NOT message.ui_hide OR :debug)" +
             " AND (NOT :found OR ui_found = :found)" +
@@ -144,7 +144,7 @@ public interface DaoMessage {
             " FROM message" +
             " JOIN account ON account.id = message.account" +
             " LEFT JOIN identity ON identity.id = message.identity" +
-            " JOIN folder ON folder.id = message.folder" +
+            " JOIN folderview AS folder ON folder.id = message.folder" +
             " WHERE message.account = :account" +
             " AND message.thread = :thread" +
             " AND (:id IS NULL OR message.id = :id)" +

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

@@ -0,0 +1,39 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    FairEmail is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018-2019 by Marcel Bokhorst (M66B)
+*/
+
+import androidx.annotation.NonNull;
+import androidx.room.DatabaseView;
+
+
+@DatabaseView(
+        viewName = "folderview",
+        value = "SELECT id, account, name, type, display, unified FROM folder")
+public class EntityFolderView {
+    public Long id;
+    public Long account;
+    @NonNull
+    public String name;
+    @NonNull
+    public String type;
+    public String display;
+    @NonNull
+    public Boolean unified = false;
+}