D6450: [Image Wallpaper] Add "Open Containing Folder" button

[Kai Uwe Broulik]

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

REVISION SUMMARY
  This allows to open the location of the folder the wallpaper is in.
  
  BUG: 371247
  FIXED-IN: 5.11.0

TEST PLAN
  F3797447: Screenshot_20170630_145327.png <https://phabricator.kde.org/F3797447>
  
  For the "Next" wallpaper which is in /usr/share/plasma/wallpapers it opened the "Next" folder and highlighted the respective sized image file (e.g 1680x1050.png)

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D6450

AFFECTED FILES
  wallpapers/image/backgroundlistmodel.cpp
  wallpapers/image/backgroundlistmodel.h
  wallpapers/image/imagepackage/contents/ui/WallpaperDelegate.qml

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