D5084: fix a crash caused by bad disconnects during debug install cancellation

[Harald Sitter]

sitter created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  the processFinished disconnect would not actually work, change it to
  function pointer syntax instead which makes the disconnect work as expected
  
  change to Qt 5.7's QOverload helper to pick the right overload for connects
  
  fix connect indentation

REPOSITORY
  R120 Plasma Workspace

BRANCH
  drkonqi-cancel-crash

REVISION DETAIL
  https://phabricator.kde.org/D5084

AFFECTED FILES
  drkonqi/debugpackageinstaller.cpp

To: sitter
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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