D25616: [scenes/opengl] Discard cached Lanczos textures for all toplevels

zzag created this revision.
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REVISION SUMMARY
  Currently, the Lanczos filter doesn't discard cached textures for
  internal and wayland clients.

TEST PLAN
  Compiles.

REPOSITORY
  R108 KWin

BRANCH
  discard-lanczos-texture-internal-wayland

REVISION DETAIL
  https://phabricator.kde.org/D25616

AFFECTED FILES
  plugins/scenes/opengl/lanczosfilter.cpp
  workspace.cpp
  workspace.h

To: zzag, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart