UIDL capability cannot change

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

@@ -3058,7 +3058,19 @@ class Core {
             // Get capabilities
             Map<String, String> caps = istore.capabilities();
             boolean hasUidl = caps.containsKey("UIDL");
-            EntityLog.log(context, account.name + " POP capabilities= " + caps.keySet());
+            EntityLog.log(context, account.name +
+                    " POP capabilities= " + caps.keySet() +
+                    " uidl=" + account.capability_uidl);
+
+            if (hasUidl) {
+                if (Boolean.FALSE.equals(account.capability_uidl)) {
+                    hasUidl = false;
+                    Log.w(account.host + " did not had UIDL before");
+                }
+            } else {
+                account.capability_uidl = false;
+                db.account().setAccountUidl(account.id, account.capability_uidl);
+            }
 
             // Get messages
             Message[] imessages = ifolder.getMessages();

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

@@ -68,7 +68,7 @@ import javax.mail.internet.InternetAddress;
 // https://developer.android.com/topic/libraries/architecture/room.html
 
 @Database(
-        version = 255,
+        version = 256,
         entities = {
                 EntityIdentity.class,
                 EntityAccount.class,
@@ -2589,6 +2589,12 @@ public abstract class DB extends RoomDatabase {
                         logMigration(startVersion, endVersion);
                         db.execSQL("ALTER TABLE `message` ADD COLUMN `ui_local_only` INTEGER NOT NULL DEFAULT 0");
                     }
+                }).addMigrations(new Migration(255, 256) {
+                    @Override
+                    public void migrate(@NonNull SupportSQLiteDatabase db) {
+                        logMigration(startVersion, endVersion);
+                        db.execSQL("ALTER TABLE `account` ADD COLUMN `capability_uidl` INTEGER");
+                    }
                 }).addMigrations(new Migration(998, 999) {
                     @Override
                     public void migrate(@NonNull SupportSQLiteDatabase db) {

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

@@ -297,6 +297,9 @@ public interface DaoAccount {
     @Query("UPDATE account SET tbd = 1 WHERE id = :id AND NOT (tbd IS 1)")
     int setAccountTbd(long id);
 
+    @Query("UPDATE account SET capability_uidl = :uidl WHERE id = :id AND NOT (capability_uidl IS :uidl)")
+    int setAccountUidl(long id, Boolean uidl);
+
     @Query("DELETE FROM account WHERE id = :id")
     int deleteAccount(long id);
 }

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

@@ -167,6 +167,7 @@ public class EntityAccount extends EntityOrder implements Serializable {
     public String capabilities;
     public Boolean capability_idle;
     public Boolean capability_utf8;
+    public Boolean capability_uidl;
 
     boolean isGmail() {
         return "imap.gmail.com".equalsIgnoreCase(host) ||