STEPS TO REPRODUCE 1. Switch to the Icons-and-Text Task Manager 2. Select "Sort: Manually" in its Settings / Behaviour 3. Open different types of windows OBSERVED RESULT New windows appear grouped by application (for example, all Okular windows are together, etc.). EXPECTED RESULT New windows should appear at the end of the list. This was the behaviour in Plasma 5 and still is with the Icons-Only Task Manager. SOFTWARE/OS VERSIONS Windows: macOS: (available in the Info Center app, or by running `kinfo` in a terminal window) Linux/KDE Plasma: KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
If you don't want grouping with enough windows open to trigger grouping, then you need to disable grouping. This is intentional AFAIK.
Grouping is disabled ("Do not group"). As I wrote, the behaviour of the Icons-only Task Manager is different, new windows are added to the end.
Re-opening this bug as per my last comment.