D25049: Conditionally show navigation buttons in the header for multi-page KCMs

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Plasma, mart.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  This makes the navigeability of multi-page KCMs completely obvious. The buttons only show
  up in multi-page KCMs where you've navigated into a sub-page, so there is no visual
  regression for anyone else.

TEST PLAN
  F7686630: demo-2019-10-29_11.19.01.webm <https://phabricator.kde.org/F7686630>

REPOSITORY
  R295 KCMUtils

BRANCH
  show-navigation-buttons-when-necessary (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D25049

AFFECTED FILES
  src/kcmoduleqml.cpp

To: ngraham, #vdg, #plasma, mart
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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