D18701: [Icon Applet] Show busy indicator when launching app

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Provides some feedback when clicking the icon.

TEST PLAN
  Placed a Dolphin icon plasmoid in my panel, clicked it, got a busy indicator while it was launching.
  Same on desktop. Same for some other apps.
  
  It doesn't work for jump list actions because they are ran by commandline rather than actual desktop file.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D18701

AFFECTED FILES
  applets/icon/CMakeLists.txt
  applets/icon/iconapplet.cpp
  applets/icon/iconapplet.h

To: broulik, #plasma
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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