D12686: Fix sidebar view regression of not prompting about unsaved changes

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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REVISION SUMMARY
  When you switch module with unsaved changes the other modes prompt if
  you want to save the changes. Sidebar mode did not.
  
  BUG: 392160

TEST PLAN
  Made a change, clicked another module. Got a prompt.
  
  Clicked apply, it applied then changed
  
  Tried again
  
  Clicked cancel, it didn't change

REPOSITORY
  R124 System Settings

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12686

AFFECTED FILES
  sidebar/SidebarMode.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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