D6142: Fix drop menu position on Wayland

[Elvis Angelaccio]

elvisangelaccio created this revision.
Restricted Application added a project: Frameworks.
Restricted Application added a subscriber: Frameworks.

REVISION SUMMARY
  On Wayland we can't rely on global cursor position.
  In particual QCursor::pos() returns a wrong position
  when called inside a dropEvent() function, which breaks
  the DropJob's popup menus.
  
  A more reliable solution is the position provided by the QDropEvent,
  though this position is relative and we need a QWidget associated to the
  job that can translate it to a global position.

TEST PLAN
  Drop something within a single Dolphin window from a wayland session.
  Without the patch the popup shows up where the drag starts.
  With the patch instead it shows up where the drag ends, as expected.

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6142

AFFECTED FILES
  src/widgets/dropjob.cpp
  src/widgets/dropjob.h

To: elvisangelaccio, dfaure, mart
Cc: #frameworks
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