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

[Ahmad Samir]

ahmadsamir added a comment.


  openHelp() will need to be changed, because the "application=" part of the url will be "systemsettings" (QCoreApplication::applicationName()), which would open the handbook of systemsettings instead of e.g. ..../kcontrol/fonts/index.html.
  
  Is the API for the redirects in the docs.kde.org url documented somewhere?

REPOSITORY
  R124 System Settings

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

To: ahmadsamir, #plasma, apol
Cc: apol, 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, ahiemstra, mart
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