Set first new account/identity primary only

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

@@ -48,8 +48,8 @@ public interface DaoIdentity {
     @Query("SELECT * FROM identity WHERE id = :id")
     LiveData<EntityIdentity> liveIdentity(long id);
 
-    @Query("SELECT * FROM identity WHERE account = :account AND `primary`")
-    EntityIdentity getPrimaryIdentity(long account);
+    @Query("SELECT COUNT(*) FROM identity WHERE synchronize")
+    int getSynchronizingIdentityCount();
 
     @Insert
     long insertIdentity(EntityIdentity identity);

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

@@ -751,6 +751,19 @@ public class FragmentAccount extends FragmentEx {
 
                     cbSynchronize.setChecked(account == null ? true : account.synchronize);
                     cbPrimary.setChecked(account == null ? true : account.primary);
+
+                    if (account == null)
+                        new SimpleTask<Integer>() {
+                            @Override
+                            protected Integer onLoad(Context context, Bundle args) {
+                                return DB.getInstance(context).account().getSynchronizingAccountCount();
+                            }
+
+                            @Override
+                            protected void onLoaded(Bundle args, Integer count) {
+                                cbPrimary.setChecked(count == 0);
+                            }
+                        }.load(FragmentAccount.this, new Bundle());
                 } else {
                     int provider = savedInstanceState.getInt("provider");
                     spProvider.setTag(provider);

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

@@ -436,6 +436,19 @@ public class FragmentIdentity extends FragmentEx {
                     cbStoreSent.setChecked(identity == null ? false : identity.store_sent);
 
                     etName.requestFocus();
+
+                    if (identity == null)
+                        new SimpleTask<Integer>() {
+                            @Override
+                            protected Integer onLoad(Context context, Bundle args) {
+                                return DB.getInstance(context).identity().getSynchronizingIdentityCount();
+                            }
+
+                            @Override
+                            protected void onLoaded(Bundle args, Integer count) {
+                                cbPrimary.setChecked(count == 0);
+                            }
+                        }.load(FragmentIdentity.this, new Bundle());
                 } else {
                     tilPassword.getEditText().setText(savedInstanceState.getString("password"));
                     grpAdvanced.setVisibility(savedInstanceState.getInt("advanced"));