If Windows 10 had the feature since 2015 (first W10 release) that would be at least 3 years after Gnome; Earliest mention I can find and that's worst case scenario for Gnome.
As for KDE Plasma it had those since at least 4.2.0, Plasma 4.2.0 announcment that version was released in 2009.
KDE had them back in the 90s. They had to - virtual desktops were a feature of pretty much any window manager more complicated than TWM. They'd have been laughed at if they didn't.
Virtual desktops: KDE / Wikipedia / Gnome
TLDR: If you don't want your desktop to be a mess, you can spawn applications in different virtual desktops, and switch between them.
Windows has had them since 10 (and obviously far earlier via 3rd party).
Yes, 15 years after everyone else (hence 3rd party).
Neat.
And macos since much earlier!
If Windows 10 had the feature since 2015 (first W10 release) that would be at least 3 years after Gnome; Earliest mention I can find and that's worst case scenario for Gnome.
As for KDE Plasma it had those since at least 4.2.0, Plasma 4.2.0 announcment that version was released in 2009.
Gnome 2 had virtual desktops
I don't know much about Gnome's history, that's why I used the earliest mention I could find.
KDE Plasma may have had it before 4.2.0 too, but I cannot find KDE 3, 2, or 1 announcements. Most likely because of the name change.
KDE had them back in the 90s. They had to - virtual desktops were a feature of pretty much any window manager more complicated than TWM. They'd have been laughed at if they didn't.
No they had to wait specifically for Plasma 420 for the most important feature. Look forward to Plasma 6.9 as well.
3rd party for win95 had it, maybe even 3.11
I think they removed the native ones on 11. Correct me if I am wrong though...
Edit: I was wrong.
I'm not on 11 yet, but Google says it's still there by default.
Thank you for the correction!