Created attachment 170808 [details]
Missing slide animation when switching activities (same virtual desktop)

SUMMARY
This started after the 6.1.0 upgrade.

I have 2 activities set up with 9 virtual desktops, aligned in a 3x3 grid. I can't find the config option right now, but I know that I had kwin configured to remember the current virtual desktop on each separate activity, which is relevant here. Not sure if this config has been removed and now defaults to always being true. Anyway, now to the issue...

Previously, when switching activities, regardless whether this also involved switching to a different virtual desktop due to the other activity being on a different one, the slide switching animation was shown, similar to when switching virtual desktops on the same activity. Now, since 6.1.0, no slide animation is shown when switching activities unless there's also a switch to a different virtual desktop involved.

Please see the attached video. The activity with the tree wallpaper is the first one, while the hexagon wallpaper is on the second activity.

A quick note though, before toggling the slide animation in the virtual desktop settings menu for the purpose of reproducing the bug in the recorded video, a slide animation was shown when switching from the first to the second activity, but not when switching from the second to the first one. But now even after restoring all settings, no animation is played at all, just like shown in the video.

STEPS TO REPRODUCE
1. Set up more than one activity and have the slide animation enabled when switching virtual desktops
2. Have activities on the same virtual desktop, switch activities, no animation at all
3. Have activities use different virtual desktops, switch activities, see the slide animation

EXPECTED BEHAVIOR
The slide animation should always be played, not just when also switching virtual desktops. For example, if the same wallpaper was used and no applications/windows were on the desktops of both activities, then the user would not be aware that the activities were indeed switched, because no animation was shown, which is confusing and bad.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1