D7770: [lookandfeel] Fix GLES incompatibilities in UserDelegate shader code

[Stefan Brüns]

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

REVISION SUMMARY
  BUG: 382668
  
  The shader compilation currently fails on GLES with errors like:
  "0:6(2): error: No precision specified in this scope for type `vec4'"
  
  GLES requires variable qualifiers like highp/lowp, whereas desktop OpenGL
  does not. As QGlShaderProgram adds suitable defines on desktop OpenGL
  for these qualifiers, it is safe to add these to a declarations, see:
  http://doc.qt.io/qt-5/qglshaderprogram.html#writing-portable-shaders

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7770

AFFECTED FILES
  lookandfeel/contents/components/UserDelegate.qml

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