D6334: [kcms/touchpad] Fix crash with 'Drag me' in X11 test area

[Christoph Feck]

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

REVISION SUMMARY
  Something really fishy was going on when dragging the 'Drag me' folder in the X11 test area onto itself.
  
  Instead of using a custom QStandardItemModel with a QListView, use a QListWidget, which comes with its own model that does not allow dropping items onto other items, but It is still possible to move the icon.
  
  Fixes https://bugs.kde.org/show_bug.cgi?id=346900 and https://bugs.kde.org/show_bug.cgi?id=366113

TEST PLAN
  Could freely drag, no crash.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D6334

AFFECTED FILES
  kcms/touchpad/src/kcm/xlib/testarea.cpp
  kcms/touchpad/src/kcm/xlib/ui/testarea.ui

To: cfeck, #plasma, knambiar
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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