Seems to work fine (-1 values for x & y position means that they shouldn't be modified):
Code: Select all
wmctrl -r "Hatari v2.1.0" -e 0,-1,-1,800,600
But how one could trigger something like that when Hatari starts, by using script that starts hatari, waits few secs and then runs wmctrl?
I remember that with some window managers one could also configure positions of windows (that have e.g. specific titles) in the window manager config. Last time I used something like that was in the 90's though.

PS. the ":SELECT:" option for wmctrl is nice, it then waits user to click on the window on which he wants it to act on.