Not mirroring layout direction in some of Qt widgets - qt

Question

I have an application which should have a right-to-left layout direction. But there some widgets(e.g. a QComboBox and a QlistWidget) which i don't want to mirror layout-direction (they should have left-to-right layout-direction whatever the layout-direction of app is).
What I'm looking for is something like LayoutMirroring.enabled in qml.
Is there a solution for this?
Edit:
This is a very simplified version of my code:
file widget.h:
#include <QWidget>
class Widget : public QWidget
{
Q_OBJECT
public:
Widget(QWidget *parent = 0);
~Widget();
};
file widget.cpp:
Widget::Widget(QWidget *parent): QWidget(parent){
setMinimumSize(300, 300);
QLabel *label1 = new QLabel("Right to left 1");
QLabel *label2 = new QLabel("Right to left 2");
QLabel *label3 = new QLabel("Right to left 3");
QComboBox *mCombo = new QComboBox();
mCombo->setMinimumWidth(150);
mCombo->addItems(QStringList({"Left to Right 1", "Left to Right 2", "Left to Right 3"}));
mCombo->setStyleSheet("QComboBox{padding: 0 10 0 10;}");
mCombo->setLayoutDirection(Qt::LeftToRight);
QVBoxLayout *mainlayout = new QVBoxLayout();
mainlayout->setAlignment(Qt::AlignLeft);
mainlayout->addWidget(mCombo);
mainlayout->addWidget(label1);
mainlayout->addWidget(label2);
mainlayout->addWidget(label3);
setLayout(mainlayout);}
and this my main.cpp:
#include "widget.h"
#include <QApplication>
#include <QDebug>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
a.setLayoutDirection(Qt::RightToLeft);
Widget w;
w.show();
qDebug()<<a.layoutDirection() <<w.layoutDirection();
return a.exec();
}
comment: my project uses a stylesheet file and after playing with different parts of style for QComboBox I realized that the style "QComboBox{padding: 0 10 0 10;}" was causing the problem. So I included that, here. If I remove that line the problem will be solved.
note: I also realized that theWidget->setLayoutDirection(Qt::LeftToRight); will do what I was looking though I don't know it's the proper way or not!

Answer 1

So, The Problem was with the stylesheet that my app is using. this line of stylesheet "QComboBox{padding: 0 10 0 10;}" was the cause of problem. I removed it and problem solved. Though I don't know the reason.
Also for a specific widget that shouldn't get the app's layout-direction, the layout-direction must be set explicitly. like: theWidget->setLayoutDirection(Qt::LeftToRight);
And I realized it from Qt documentaion