D18182: Fix new file creation leading to dupe items on a fresh view

[Eike Hein]

hein created this revision.
hein added reviewers: Plasma, McPain.
Herald added a project: Plasma.
hein requested review of this revision.

REVISION SUMMARY
  This was a regression caused by the code attempting to insert new items
  at drop position, if available. `setSortMode` was being called in a slot
  connected to the dir model's rowsInserted, but the Positioner has to be
  initialized earlier as a proxy needs to handle
  `sourceRowsAboutToBeInserted` as well.
  
  Thanks to an investigation and patch by Oleg Solovyov in D17689 <https://phabricator.kde.org/D17689> for
  helping to get to the bottom of this.
  
  This is aimed at 5.12+.

REPOSITORY
  R119 Plasma Desktop

BRANCH
  Plasma/5.12

REVISION DETAIL
  https://phabricator.kde.org/D18182

AFFECTED FILES
  containments/desktop/plugins/folder/foldermodel.cpp

To: hein, #plasma, McPain
Cc: plasma-devel, kvanton, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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