D22145: Add "Open Containing Folder" feature

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: Okular, aacid, sander.
Herald added a project: Okular.
Herald added a subscriber: okular-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  This patch adds an "Open Containing Folder" menu item to the file menu, similar to
  other KDE apps like Gwenview that have it there. This action is especially useful
  for the case when you've downloaded a PDF from the internet that opens itself in
  Okular. The location of this file may not be clear or easy to find without this
  feature, and on several occasiona I have found myself wishing for it when this
  happens.

TEST PLAN
  - Delete or move aside `~/.local/config/kxmlgui5/okular/part.rc`
  - Menu item is enabled and works when there is an open document: F6940449: Enabled when a document is open.png <https://phabricator.kde.org/F6940449>
  - Menu item is disabled when there is no open document: F6940448: Disabled when no document is open.png <https://phabricator.kde.org/F6940448>

REPOSITORY
  R223 Okular

BRANCH
  add-open-containing-folder-feature (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D22145

AFFECTED FILES
  part.cpp
  part.h
  part.rc

To: ngraham, #okular, aacid, sander
Cc: okular-devel, fbampaloukas, joaonetto, tfella, ngraham, darcyshen, aacid
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