Fixed sqlite crashes

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

@@ -79,14 +79,16 @@ public abstract class DB extends RoomDatabase {
             sInstance = migrate(Room
                     .databaseBuilder(context.getApplicationContext(), DB.class, DB_NAME)
                     .setJournalMode(JournalMode.WRITE_AHEAD_LOGGING));
+
         return sInstance;
     }
 
-    public static DB getBlockingInstance(Context context) {
-        return migrate(Room
-                .databaseBuilder(context.getApplicationContext(), DB.class, DB_NAME)
-                .setJournalMode(JournalMode.WRITE_AHEAD_LOGGING)
-                .allowMainThreadQueries());
+    @Override
+    public void beginTransaction() {
+        // This is a workaround for sqlite crashing on some devices
+        // Confusingly, the journal mode needs to be set to write ahead logging first for this to work
+        getOpenHelper().setWriteAheadLoggingEnabled(false);
+        super.beginTransaction();
     }
 
     private static DB migrate(RoomDatabase.Builder<DB> builder) {

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

@@ -900,15 +900,6 @@ public class FragmentCompose extends FragmentEx {
 
             String pbody = "<pre>" + body.replaceAll("\\r?\\n", "<br />") + "</pre>";
 
-            // Check data
-            if (action == R.id.action_send) {
-                if (draft.identity == null)
-                    throw new IllegalArgumentException(context.getString(R.string.title_from_missing));
-
-                if (draft.to == null && draft.cc == null && draft.bcc == null)
-                    throw new IllegalArgumentException(context.getString(R.string.title_to_missing));
-            }
-
             try {
                 db.beginTransaction();
 
@@ -940,6 +931,15 @@ public class FragmentCompose extends FragmentEx {
                     db.message().updateMessage(draft);
                     draft.write(context, pbody);
 
+                    // Check data
+                    if (action == R.id.action_send) {
+                        if (draft.identity == null)
+                            throw new IllegalArgumentException(context.getString(R.string.title_from_missing));
+
+                        if (draft.to == null && draft.cc == null && draft.bcc == null)
+                            throw new IllegalArgumentException(context.getString(R.string.title_to_missing));
+                    }
+
                     // Save message ID
                     String msgid = draft.msgid;