D5504: Introduce a HasLauncher data role.

[Eike Hein]

hein created this revision.
Restricted Application added a project: Plasma.

REVISION SUMMARY
  This is implemented by TasksModel and allows clients to reliably
  query whether a row has an associated launcher. Useful for things
  like Pin/Unpin action state or layout decisions.
  
  Previously clients would have to reimplement something like
  TaskTools::appsMatch on top of the model, which we absolutely do
  not want to do - there should only be one copy of the app matching
  logic for consistency's sake. In practice clients would do things
  like fetch LauncherUrl and run it by launcherPosition(), which
  omits appsMatch's AppId comparision, as an example of such unwated
  drift. This approach also avoids the large performance overhead
  involved.
  
  The role is not implemented by the single-type or munging tasks
  models as it has no use there.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5504

AFFECTED FILES
  libtaskmanager/abstracttasksmodel.h
  libtaskmanager/tasksmodel.cpp

To: hein, #plasma, davidedmundson
Cc: plasma-devel, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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