D7571: Enable modifying root-owned files in Dolphin

[Chinmoy Ranjan Pradhan]

chinmoyr created this revision.
Restricted Application added a subscriber: Konqueror.

REVISION SUMMARY
  This patch adds PrivilegeExecution flag to KIO jobs in dolphin thus enabling them to perform file operation with elevated privileges.
  Depends on https://phabricator.kde.org/D7563 for context menu to show properly.
  
  TODO:
  
  - Rename action for multiple selections in a read-only folder is disabled because mass rename uses CopyJob in a loop and doing it in a read-only folder will trigger multiple prompts. Enable it again.
  - Trashing from read-only folder shows error. Fix it.

REPOSITORY
  R318 Dolphin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7571

AFFECTED FILES
  src/dolphinmainwindow.cpp
  src/dolphinpart.cpp
  src/panels/folders/folderspanel.cpp
  src/panels/folders/treeviewcontextmenu.cpp
  src/views/dolphinview.cpp
  src/views/draganddrophelper.cpp

To: chinmoyr, #dolphin, dfaure, emmanuelp
Cc: elvisangelaccio, #konqueror
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