[docking] Window cannot be dragged out of current monitor

[garyng]

In the docking branch, the window cannot be dragged out of the current monitor:

[mellinoe]

This is working for me. Have you changed anything about the sample program, or have you built the native DLL yourself, or anything like that? The only other difference I note is that your "first monitor" is on the right, and your "second" is on the left. Mine are the opposite, and I wonder if that has anything to do with it. Alternatively, there is this issue which describes some potential problems relating to different DPIs across monitors. Does any of that sound like it might affect you?

[garyng]

The only thing I changed is I removed vulkan as the preferred backend (I can't make it run with vulkan though).

After some experiments, I think the arrangement of monitors do make a difference! This is the my setup:

1: 1920x1080
2: 2560x1080
3: 1080x1920

I couldn't move my window from 1 to 3, or 2 to 3:

Seems like the monitor boundary is calculated wrongly?

Weirdly, I cant even move the window out of the main viewport on monitor 3 (the horizontal one):

This is the metric window showing the monitors info:

It only shows 2 monitors instead of 3...

[garyng]

So monitor 3 was missing from the monitors list, this is probably the cause instead of the monitor arrangement.

All 3 monitors showed up in the official imgui demo app:

[mellinoe]

Can you try out the latest change in the docking branch that I just pushed?

69ffb61

[garyng]

Yeah, it works now! A quick fix!

Thanks!