D27518: Only enable the "Help" button if khelpcenter is available

[Ahmad Samir]

ahmadsamir created this revision.
ahmadsamir added a reviewer: Plasma.
Herald added a project: Plasma.
ahmadsamir requested review of this revision.

REVISION SUMMARY
  Use a static const bool to check if khelpcenter is available on the
  system, so as not to check every time a module is opened.
  
  BUG: 400602

TEST PLAN
  - make sure khelpcenter is not installed and open systemsettings
  - navigate to any module (one that has Help visible, e.g. Fonts), "Help" button is disabled
  - install khelpcenter and restart systemsettings, the "Help" button should be enabled

REPOSITORY
  R124 System Settings

BRANCH
  l-khelp (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D27518

AFFECTED FILES
  core/ModuleView.cpp

To: ahmadsamir, #plasma
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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