systemdialog: also consider buttonbox for dimensions
otherwise the dialog may be shrunk beyond the space that the buttonbox desires resulting in cut off buttons (only when the mainItem is small enough, naturally)
otherwise the dialog may be shrunk beyond the space that the buttonbox desires resulting in cut off buttons (only when the mainItem is small enough, naturally)
mentioned in commit f4b7cbb6
·mentioned in commit f4b7cbb6