Sets the stretch factor of column column to stretch. The first column is number 0.
The stretch factor is relative to the other columns in this grid. Columns with a higher stretch factor take more of the available space.
The default stretch factor is 0. If the stretch factor is 0 and no other column in this table can grow at all, the column may still grow.
Referenced by AddDialog::AddDialog(), Dialog::createGridGroupBox(), MainWindow::createToolBox(), Dialog::Dialog(), QErrorMessage::QErrorMessage(), QFontDialog::QFontDialog(), and WidgetGallery::WidgetGallery().