Wire activity/fragment back

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

@@ -750,6 +750,9 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
     @Override
     public boolean onOptionsItemSelected(@NonNull MenuItem item) {
         if (item.getItemId() == android.R.id.home) {
+            // Delegate to fragment first
+            if (super.onOptionsItemSelected(item))
+                return true;
             performBack();
             return true;
         }

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

@@ -40,6 +40,7 @@ import android.os.Handler;
 import android.os.ResultReceiver;
 import android.text.TextUtils;
 import android.view.LayoutInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.inputmethod.InputMethodManager;
@@ -315,6 +316,18 @@ public class FragmentBase extends Fragment {
         lbm.unregisterReceiver(receiver);
     }
 
+    @Override
+    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
+        if (item.getItemId() == android.R.id.home) {
+            FragmentActivity activity = getActivity();
+            if (activity != null) {
+                activity.getOnBackPressedDispatcher().onBackPressed();
+                return true;
+            }
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
     @Override
     public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
         EntityLog.log(getContext(), "Result class=" + this.getClass().getSimpleName() +