Merge pull request #13105 from nextcloud/backport/13037/stable-3.29

[stable-3.29] Fix Crash Show Fragment During FileActivity Lifecycle Change

app/src/main/java/com/owncloud/android/ui/activity/FileActivity.java

@@ -520,17 +520,16 @@ protected void updateFileFromDB(){
  * Show loading dialog
  */
  public void showLoadingDialog(String message) {
- // grant that only one waiting dialog is shown
  dismissLoadingDialog();
- // Construct dialog
+
  Fragment frag = getSupportFragmentManager().findFragmentByTag(DIALOG_WAIT_TAG);
  if (frag == null) {
  Log_OC.d(TAG, "show loading dialog");
  LoadingDialog loading = LoadingDialog.newInstance(message);
  FragmentManager fm = getSupportFragmentManager();
  FragmentTransaction ft = fm.beginTransaction();
- loading.show(ft, DIALOG_WAIT_TAG);
- fm.executePendingTransactions();
+ ft.add(loading, DIALOG_WAIT_TAG);
+ ft.commitAllowingStateLoss();
  }
  }