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windowManager: Add "opacity: 0" to minimize ease animation

Keyu Tao requested to merge taoky/gnome-shell:add-opacity-to-minimize-animation into main 
Extensions like dash-to-dock use set_icon_geometry() to window.
This changes the dest and scale of ease animation of minimize and
makes it looks very strange. By setting dest opacity to 0 the animation
could be more natural.

This problem has been reported to dash-to-dock extension by someone else in Nov 2022: https://github.com/micheleg/dash-to-dock/issues/1881. However, it's marked as a gnome-shell bug but I don't find any issue or MR in GNOME/gnome-shell related to this.

For myself when using GNOME 43/44, I just wrote an extension to set MINIMIZE_WINDOW_ANIMATION_TIME in js/ui/windowManager.js to 0 so minimize animation could be disabled. But this won't work in GNOME 45 with ESM, so I guess the best approach is to make the minimize animation better within gnome-shell.

I have tested this in a Fedora 39 VM with wayland session.

Before:

Kooha-2023-09-25-19-47-30

After:

Kooha-2023-09-25-19-48-37

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