D18649: [GridViewKCM] improve contrast and legibility for delegates' inline hover buttons

[Nathaniel Graham]

ngraham edited the test plan for this revision.

REPOSITORY
  R296 KDeclarative

REVISION DETAIL
  https://phabricator.kde.org/D18649

To: ngraham, #vdg, #plasma, broulik
Cc: ndavis, andreask, filipf, abetts, GB_2, kde-frameworks-devel, michaelh, 
ngraham, bruns