I'm using solaris 5.8, Qt 4.2.2 and gcc 3.3 and have been trying to create a dialog with no margin or spacing for its child widgets. Unfortunately, things aren't going too well. It turns out that i only get the desired effect if i use a QWidget or QMainWindow instead of a QDialog. Could this be a bug in Qt?

Below is some code that produces two windows, one being a QDialog and the other a QWidget. The QDialog behaves incorrectly, insisting on drawing a margin and spacing for the child widgets, while the QWidget has the desired behavior.

Qt Code: 
  1. #include <QApplication>
  2. #include <QDialog>
  3. #include <QVBoxLayout>
  4. #include <QPushButton>
  5.  
  6. int main(int argc, char** argv)
  7. {
  8.   QApplication app(argc, argv);
  9.  
  10.   //////////////////////////////////////////////////////////////////////
  11.   // create a dialog with two buttons
  12.  
  13.   QDialog diag;
  14.   diag.setWindowFlags(Qt::Widget);
  15.   diag.setWindowTitle("dialog");
  16.   QVBoxLayout* layout = new QVBoxLayout();
  17.   diag.setLayout(layout);
  18.  
  19.   QSizePolicy policy(QSizePolicy::Minimum, QSizePolicy::Minimum);
  20.   QPushButton* button1 = new QPushButton("button1");
  21.   button1->setSizePolicy(policy);
  22.   layout->addWidget(button1);
  23.  
  24.   QPushButton* button2 = new QPushButton("button2");
  25.   button2->setSizePolicy(policy);
  26.   layout->addWidget(button2);
  27.  
  28.   layout->setMargin(0);
  29.   layout->setSpacing(0);
  30.  
  31.   diag.show();
  32.  
  33.   //////////////////////////////////////////////////////////////////////
  34.   // create a widget with two buttons
  35.  
  36.   QWidget widg;
  37.   widg.setWindowTitle("widget");
  38.   layout = new QVBoxLayout();
  39.   widg.setLayout(layout);
  40.  
  41.   button1 = new QPushButton("buttonA");
  42.   button1->setSizePolicy(policy);
  43.   layout->addWidget(button1);
  44.  
  45.   button2 = new QPushButton("buttonB");
  46.   button2->setSizePolicy(policy);
  47.   layout->addWidget(button2);
  48.  
  49.   layout->setMargin(0);
  50.   layout->setSpacing(0);
  51.  
  52.   widg.show();
  53.  
  54.   return app.exec();
  55. }
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Please, can any of you confirm the incorrect behavior? Or maybe i'm alone out here on Solaris island?

Thanks in advance!