D8473: Modernize code. Use nullptr where it's possible

[Laurent Montel]

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

REVISION SUMMARY
  Remove extra ';'
  Use override everywhere as we already use it in some part of code
  Fix potential crash when we delete a pointer

TEST PLAN
  build/using :)

REPOSITORY
  R119 Plasma Desktop

BRANCH
  modernize_folderplugin

REVISION DETAIL
  https://phabricator.kde.org/D8473

AFFECTED FILES
  containments/desktop/plugins/folder/directorypicker.cpp
  containments/desktop/plugins/folder/foldermodel.cpp
  containments/desktop/plugins/folder/foldermodel.h
  containments/desktop/plugins/folder/labelgenerator.cpp
  containments/desktop/plugins/folder/mimetypesmodel.cpp
  containments/desktop/plugins/folder/mimetypesmodel.h
  containments/desktop/plugins/folder/placesmodel.h
  containments/desktop/plugins/folder/positioner.cpp
  containments/desktop/plugins/folder/positioner.h
  containments/desktop/plugins/folder/previewpluginsmodel.cpp
  containments/desktop/plugins/folder/previewpluginsmodel.h
  containments/desktop/plugins/folder/rubberband.h
  containments/desktop/plugins/folder/shortcut.h
  containments/desktop/plugins/folder/viewpropertiesmenu.cpp
  containments/desktop/plugins/folder/viewpropertiesmenu.h

To: mlaurent
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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