D12431: Fix GrantleeTheme::ThemeManager being leaked.

[David Faure]

dfaure created this revision.
dfaure added a reviewer: mlaurent.
Restricted Application added a project: KDE PIM.
dfaure requested review of this revision.

REVISION SUMMARY
  When a Viewer was deleted, its ThemeManager was kept alive.
  So it would still react to KDirWatch (when installing files) and it
  would try to update a menu (QActionGroup) that was deleted with the
  viewer.
  
  BUG: 383070
  FIXED-IN: 18.04

TEST PLAN
  KMail, Enter to open separate viewer, Alt+F4 <https://phabricator.kde.org/F4>, (uncommitted)
  debug output shows that now the ThemeManager is deleted, while it wasn't before.

REPOSITORY
  R81 KDE PIM Addons

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D12431

AFFECTED FILES
  plugins/messageviewerheaderplugins/grantleeheaderstyleplugin/grantleeheaderstyleinterface.cpp

To: dfaure, mlaurent
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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