In TWM, how to move a window that is completely offscreen? [duplicate]

Question

I've managed to get GIMP starting up completely off-screen somehow. Other applications are unaffected because they use click-to-place, but GIMP wants to just place it's own window.

What methods are there to get this window back on-screen?

I can see the application's "icon" in the twm "icon manager" and I can even see it minimised, but restore the window and it goes away off-screen. I can select Move from the "Super + middleclick-on-desktop" menu which calls f.move but that will only move the minimised icon.

The man page says I can set DontMoveOff in .twmrc but that's about moving, not an application starting itself at specific coordinates.

Running the command with -geometry is also a common solution, but gimp does not know this parameter.

$ gimp -geometry 1000x1000+10+10
Unknown option -geometry

In MS Windows, one can use + Spacebar to force a menu, one item being "move" which allows the window to be moved. But there doesn't appear to be a similar keypress in twm

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Suggestions for wmctrl look positive, but twm seems to be too old to support this particular solution.

$ wmctrl -l
Cannot get client list properties. 
(_NET_CLIENT_LIST or _WIN_CLIENT_LIST)

Answer 1

This answer is specific to GIMP, because it does not support standard X11 toolbox parameters like -geometry

1. Run gimp with at least two filenames as parameters gimp image1.jpg image2.jpg
2. The title spash screen is click-to-place.
3. The first image will place itself, likely not visible on screen.
4. Subsequent images are click-to-place, so do so.

Now you have access to a gimp window.

5. Edit --> Preferences --> Window Management
   
6. Reset Saved Window Positions will restore things to one combined Window, and set the other options as you see fit.
7. OK and quit gimp. On restart, it should be more visible. If you want to return to multiple window mode, that's an option in the Windows menu.