When a window is pinned to the side of a screen, maximizing will sometimes maximize in the other screen.

• Cinnamon version: Cinnamon 4.0.10
• Distribution: Arch Linux (64-bit)
• Graphics hardware: NVidia GeForce GTX 980 Ti
• Graphics driver: nvidia 418.56

I don't think syslog and .xsession-errors are needed here (I think it's a logic bug instead of an error), but I can attach them upon request.

Issue

I'm currently running a two-monitor setup.

When I pin a window to one side of a monitor [1] and click the "maximize" button, the window will sometimes maximize in the other monitor (the monitor that it's currently not half-maximized in).

I assume this might have something to do with the window not updating which monitor it's being displayed on when you click and drag to pin it, but I haven't dug into the code to confirm.

[1]: I'm not sure what the correct Cinnamon terminology is here, but I drag the window with my mouse all the way to the left or right of a monitor until it maximizes in half of the screen.

Steps to reproduce

1. On a two-monitor setup (one monitor to the left, and one monitor to the right), open a new unmaximized window on the left monitor. (could be gnome-terminal, for example)
2. Pin the window to the left side of the right monitor, so that it's half-maximized on the left side of that monitor.
3. Click the maximize button. For me, this results in the window (sometimes?) being maximized on the left monitor.

Expected behaviour

The window should maximize on the right-side monitor.

Reproduce the issue using the two-monitor setup and the listed steps, then trace the maximize-button and edge-pinning window-management entry points. Compare the monitor selected after pinning with the monitor used for maximization; done when the window consistently maximizes on the monitor where it is half-maximized.