New desktop are named the exactly same.
STEPS TO REPRODUCE
1. Open desktops KCM
2. Click "Add"
The newly added desktop is named "New Desktop". If you add 5 desktops, they will all be named the same: "New Desktop", renaming them will require some effort from the user.
Name them differently by default, for example i18n("Desktop %1").arg(<desktop index + 1>).
Operating System: Fedora 30
KDE Plasma Version: 5.15.5
KDE Frameworks Version: 5.59.0
Qt Version: 5.12.4
Kernel Version: 5.1.17-300.fc30.x86_64
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15,4 ГиБ
Agreed. How about you submit a patch? :)
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/1053
*** Bug 442162 has been marked as a duplicate of this bug. ***
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/3252
Git commit b34a5a4b4bf58302be7e50e0fa0cec21fa6743fb by Nate Graham, on behalf of Thenujan Sandramohan.
Committed on 14/12/2022 at 21:24.
Pushed by ngraham into branch 'master'.
kcmkwin/kwindesktop: Make new virtual desktops have numbered names
M +14 -2 src/kcmkwin/kwindesktop/desktopsmodel.cpp
M +2 -1 src/kcmkwin/kwindesktop/desktopsmodel.h
M +1 -1 src/kcmkwin/kwindesktop/package/contents/ui/main.qml