Comment 3 for bug 1786978

The problem: window's not big enough. Our default is somehow 640x480 while upstream default (for the past 8 years!) has been 800x600:
https://github.com/lxqt/qterminal/blame/master/src/config.h#L68

So the fix is two-fold:

1. Modify /etc/xdg/xdg-Lubuntu/qterminal.org/qterminal.ini from lubuntu-default-settings to include (yes, I've tested that only this is necessary):
[MainWindow]
size=@Size(800 600)

2. Modify /usr/share/nm-tray/nm-tray.conf from nm-tray such that xterm is replaced with qterminal. Both use the same -e switch so no other changes are necessary.