Fix next prev image with QtGui -> Qt

labelme/app.py

@@ -1407,8 +1407,7 @@ class MainWindow(QtWidgets.QMainWindow):
 
     def openPrevImg(self, _value=False):
         keep_prev = self._config['keep_prev']
-        if QtGui.Qt.keyboardModifiers() == \
-                (QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier):
+        if Qt.KeyboardModifiers() == (Qt.ControlModifier | Qt.ShiftModifier):
             self._config['keep_prev'] = True
 
         if not self.mayContinue():
@@ -1430,8 +1429,7 @@ class MainWindow(QtWidgets.QMainWindow):
 
     def openNextImg(self, _value=False, load=True):
         keep_prev = self._config['keep_prev']
-        if QtGui.QGuiApplication.keyboardModifiers() == \
-                (QtCore.Qt.ControlModifier | QtCore.Qt.ShiftModifier):
+        if Qt.KeyboardModifiers() == (Qt.ControlModifier | Qt.ShiftModifier):
             self._config['keep_prev'] = True
 
         if not self.mayContinue():