I created a rule in kwin to remove borders on windows at launch.

(systemsettings -> window behaviour -> kwin rules
 -> new rule
            [normal window]
            [no title and no borders ]  ; apply initially ; yes
)

and now, when I open an application, it is displayed on all activities
unlike the normal behaviour (with borders) where it is only displayed on the current activity.

Borders should only be related to a window's appearance and they should not modify wheter a window is linked to an activity or all activites.

Reproducible: Always

Steps to Reproduce:
1. create a new kwin rule which remove borders
2. create 2 activities
3. open an application
4. switch to the other activty
5. the application is on the activity (all activities)
Actual Results:  
the window is displayed on all activities

Expected Results:  
the window should be displayed on the current activty