D21225: set the wallpaper when applying look and feel

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  A LNF package can optionally define a wallpaper
  which can be either a wallpaper package name or a
  file name to be found in either of the standard wallpaper locations
  (/usr/share/wallpapers, ~/.local/share wallpapers and so on)
  
  when a lnf is switched and the new one contains a wallpaper,
   the wallpaper of the primary screen of the current activity of plasma
  (and only that one) will be switched to the new wallpaper

TEST PLAN
  tested with both themes that specify a wallpaper and those who don't
  also tested with themes with an invalid wallpaper in which case it notices and
  doesn't try to switch

REPOSITORY
  R119 Plasma Desktop

BRANCH
  mart/wallpaperLoolAndFeel

REVISION DETAIL
  https://phabricator.kde.org/D21225

AFFECTED FILES
  kcms/lookandfeel/kcm.cpp
  kcms/lookandfeel/kcm.h

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