D5694: activate all suitable launchers instead of only the first encountered

[Kai Uwe Broulik]

broulik added a reviewer: Plasma.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D5694

To: sitter, #plasma
Cc: graesslin, plasma-devel, spstarr, progwolff, Zren, lesliezhai, ali-mohamed, 
jensreuterberg, abetts, sebas, apol, lukas