Inspired by "Expanding Dialog" example I've tried to do something similar, however:
- my hidden content is within a tab.
- the tab should resize vertically (maintain horizontal width)
- the dialog should resize accordingly.

The UI file is here: http://dentharg.pl/photoqueue.ui.

The code within constructor:

ui.setupUi(this);
ui.grpSourceDestination->hide();
ui.tabMain->layout()->setSizeConstraint(QLayout::SetFixedSize);
layout()->setSizeConstraint(QLayout::SetFixedSize());

but of course doesn't work as expected.

Is it at all possible to do such resizable tabwidget/dialog?

Thanks!