remove risky qApp->processEvents() call (#6161)

src/app/qgisapp.cpp

@@ -11091,23 +11091,6 @@ void QgisApp::showProgress( int progress, int totalSteps )
     }
     mProgressBar->setMaximum( totalSteps );
     mProgressBar->setValue( progress );
-
-    if ( mProgressBar->maximum() == 0 )
-    {
-      // for busy indicator (when minimum equals to maximum) the oxygen Qt style (used in KDE)
-      // has some issues and does not start busy indicator animation. This is an ugly fix
-      // that forces creation of a temporary progress bar that somehow resumes the animations.
-      // Caution: looking at the code below may introduce mild pain in stomach.
-      if ( strcmp( QApplication::style()->metaObject()->className(), "Oxygen::Style" ) == 0 )
-      {
-        QProgressBar pb;
-        pb.setAttribute( Qt::WA_DontShowOnScreen ); // no visual annoyance
-        pb.setMaximum( 0 );
-        pb.show();
-        qApp->processEvents();
-      }
-    }
-
   }
 }