D12455: kcm_opengl: Fix EGL info retrieval.

[Lindsay Roberts]

roberts created this revision.
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REVISION SUMMARY
  Under certain contexts (tested with Mesa 18.0.1 + AMDGPU) eglMakeCurrent()
  fails with EGL_BAD_ACCESS. At this point the KCM gives up on EGL info
  retrieval. This seems to be caused - correctly or otherwise - by a dangling
  glX context. Explictly setting no glX context current at cleanup fixes the
  issue.

TEST PLAN
  kcmshell5 opengl should correctly display EGL information.

REPOSITORY
  R102 KInfoCenter

BRANCH
  kcm_opengl_fix_egl (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D12455

AFFECTED FILES
  Modules/opengl/opengl.cpp

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