Windows Print&FileWindowManager screen bounding box does not accurately represent multiple screens.

[nrnhines]

See #1487 and the forum comments after https://www.neuron.yale.edu/phpBB/viewtopic.php?p=19226#p19226

Setting up a windows virtualbox guest with two screens and arranging as follows

Then starting nrngui from screen 1 and popping up a Print&FileWindowManager and placing a Graph window in the top right corner of screen 2, gives

Saving a session file, the view of the Graph is

{save_window_.view(0, -80, 5, 120, -406, 1165, 300.6, 200.8)}

Exiting, relaunching nrngui, and loading the session file generates a Graph in the correct position on Screen 2 and the same PFWM arrangement as above.

[philbrooksIII]

(Following up from my posts as graphpaper on https://www.neuron.yale.edu/phpBB/viewtopic.php?p=19226#p19226)
Here's another example of the issue as seen on a native Windows 10 machine:
Monitors arranged as follows:

Putting a graph window at all four corners of each screen appears as follows in PFWM:

And saving the session, exiting and relaunching nrngui, then loading the session generates graphs in the positions shown here:

Interestingly, negative x coordinates seem to be unaffected, while the negative y coordinates are shifted to y=0 (the boxes above the bounding box are moved down, but those to the left aren't moved right). The example above misses this behavior since only negative x coordinates are probed.