I have a three-monitor setup with horizontal splits on the left and right monitor. I have one app in the right-most split and one in the left-most split. Can I then set an app in the middle that stretches the middle space, which means half of the left monitor, all of the middle monitor and half of the right monitor?

Snapping doesn't seem to work when trying to get edges to snap to the splits. And fill only fills according to a single monitor split, so doesn't fill across the three monitors unless it's a stretch for all monitors.

Okay, I wrote a function to set the x-value to -960 and to stretch 3840.