D7888: Make sure OpenGL Context is valid before deleting shader

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: KWin, kwin, plasma-devel.

REVISION SUMMARY
  Deleting the lanczos filter deletes it's GLShader, this calls
  glDeleteProgram
  
  glFooBar always needs to have an openGL context, we don't know we have
  this on a screen changed event as it is called from outside the normal
  render methods.
  
  BUG: 384884

TEST PLAN
  Ran on my wayland session. Switched geometry a lot, couldn't reproduce the crash.
  Ran on my desktop session, seemed the same as before

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7888

AFFECTED FILES
  scene_opengl.cpp
  scene_opengl.h

To: davidedmundson, #plasma
Cc: plasma-devel, kwin, #kwin, bwowk, ZrenBot, progwolff, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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