Apologies in advance if this is by design. Prior to Plasma5 the Icon Only Task Manager would group icons belonging to the same application together. This is not the case with the Plasma5 version, which shows individual icons. See attached screen-shots, using the Gimp as an example. Reproducible: Always
Created attachment 94488 [details] gimp-grouped-icons Grouped Icons - GIMP 2.8.14 / KDE Platform Version 4.14.7
Created attachment 94489 [details] gimp-individual-icons Individual Icons - GIMP 2.8.14 / Plasma 5
Updated information relating to this following discussion on the openSUSE forum ( https://forums.opensuse.org/showthread.php/509590-updated-to-openSUSE-20150903-%28Tumbleweed%29?p=2727492#post2727492 ) This appears to only happen with GIMP. Trying Thunderbird and Libreoffice (as non native KDE applications) group correctly. There is also rather strange behaviour whereby upon opening a second image window in GIMP all of the (until then separate) icons group together.
The reason e.g. the Toolbox isn't getting grouped is because the Task Manager normally doesn't create buttons for utility windows, unless they are in "demanding attention" (taskbar notification) state. In "demanding attention" state windows also aren't grouped. This is in some sense a Gimp bug because it shouldn't be setting that state on the toolbox in the first place, however the Task Manager should probably be regrouping after the window is raised and the attention request dismissed. It's probably not doing this because it it decides to ignore the utility window at that point. There's two solutions: - Ignore utility windows even if they demand attention - Fix the regrouping not occuring #2 is probably better
Git commit c34550cf4a7e93a5e14e882b01f7ab0cb24936ec by Eike Hein. Committed on 30/09/2015 at 23:03. Pushed by hein into branch 'master'. Fix utility windows not being removed from task tree after demands-attention state is cleared. Utilility windows are typically omitted from the task tree, unless they are in demands-attention state. SVN r901886 (cf. bug 178509 from 2008) introduced a bug by preventing tasks included in this fashion from reaching active state, causing the demands-attention state not to ever be cleared. Additionally, a separate bug prevented utility windows losing demands-attention state from being removed from the task tree thereafter. This patch fixes both. This cropped up with recent versions of The Gimp, which curiously sets its utility windows to demand attention when opened from within the app. Since windows demanding attention are also implicitly exemped from grouping, this appeared to users as a failure of the grouping logic. Related: bug 178509 M +6 -4 libtaskmanager/groupmanager.cpp M +1 -1 libtaskmanager/taskmanager.cpp http://commits.kde.org/plasma-workspace/c34550cf4a7e93a5e14e882b01f7ab0cb24936ec
Eike, Thanks - appreciate your work on this :)