D10463: [WIP/RFC] Consistently use a Toolbar for headers

[Aleix Pol Gonzalez]

apol added a comment.


  See https://phabricator.kde.org/D10471

REPOSITORY
  R134 Discover Software Store

REVISION DETAIL
  https://phabricator.kde.org/D10463

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