D23274: [WIP] Add "Show intro page" button to System Settings sidebar

[Björn Feber]

GB_2 created this revision.
GB_2 added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
GB_2 requested review of this revision.

REVISION SUMMARY
  BUG: 405956
  F7262289: System Settings Sidebar Show Intro Page Button.png <https://phabricator.kde.org/F7262289>
  WIP because I couldn't figure out how to reset the active sidebar selection.

TEST PLAN
  Open System Settings and click on the "Show intro page" button.

REPOSITORY
  R124 System Settings

BRANCH
  add-show-intro-page-button-to-system-settings-sidebar (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23274

AFFECTED FILES
  sidebar/SidebarMode.cpp
  sidebar/SidebarMode.h
  sidebar/package/contents/ui/CategoriesPage.qml

To: GB_2, #plasma, #vdg
Cc: #vdg, plasma-devel, #plasma, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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