Clean up FTS table on update

k9mail/src/main/java/com/fsck/k9/mailstore/LocalStore.java

@@ -153,7 +153,7 @@ public class LocalStore extends Store implements Serializable {
      */
     private static final int THREAD_FLAG_UPDATE_BATCH_SIZE = 500;
 
-    public static final int DB_VERSION = 55;
+    public static final int DB_VERSION = 56;
 
 
     public static String getColumnNameForFlag(Flag flag) {

k9mail/src/main/java/com/fsck/k9/mailstore/migrations/MigrationTo56.java

@@ -0,0 +1,11 @@
+package com.fsck.k9.mailstore.migrations;
+
+
+import android.database.sqlite.SQLiteDatabase;
+
+
+class MigrationTo56 {
+    static void cleanUpFtsTable(SQLiteDatabase db) {
+        db.execSQL("DELETE FROM messages_fulltext WHERE docid NOT IN (SELECT id FROM messages WHERE deleted = 0)");
+    }
+}

k9mail/src/main/java/com/fsck/k9/mailstore/migrations/Migrations.java

@@ -64,6 +64,8 @@ public class Migrations {
                 MigrationTo54.addPreviewTypeColumn(db);
             case 54:
                 MigrationTo55.createFtsSearchTable(db, migrationsHelper);
+            case 55:
+                MigrationTo56.cleanUpFtsTable(db);
         }
     }
 }