Android: Strange default size of QDialogs

Create a window with a button, hook the button up so clicking it opens a QDialog with a QHBoxLayout containing a QPushButton.

When running this on desktop, the dialog's default position will be center
on the parent window, and the dialog's default size will be based on the layout's size. When running it on Android (on either GL- or raster-based platform plugin), the dialog will be tiny (too tiny to contain the button) and it will be in the top left corner of the screen.