D16006: Fix disabling of DolphinNewFileMenu

[Elvis Angelaccio]

elvisangelaccio created this revision.
elvisangelaccio added a reviewer: Dolphin.
Herald added a project: Dolphin.
Herald added a subscriber: kfm-devel.
elvisangelaccio requested review of this revision.

REVISION SUMMARY
  Commit e133c4557ecc37ed3f7e1b9 <https://phabricator.kde.org/R318:e133c4557ecc37ed3f7e1b9418306aa8cc516865> doesn't work because the actions in the
  KNewFileMenu are added only when we show the context menu for the first
  time.
  
  Fixes the failing test cases in D16005 <https://phabricator.kde.org/D16005>.

TEST PLAN
  Run `dolphinmainwindowtest` and open the context menu in different places (Home, Root, Trash, `bluetooth:/`, etc.)

REPOSITORY
  R318 Dolphin

BRANCH
  Applications/18.08

REVISION DETAIL
  https://phabricator.kde.org/D16006

AFFECTED FILES
  src/dolphinmainwindow.cpp

To: elvisangelaccio, #dolphin
Cc: kfm-devel, feverfew, spoorun, navarromorales, firef, andrebarros, emmanuelp
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