D24785: Store stashed model index as QPersistentModelIndex

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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REVISION SUMMARY
  Otherwise we can crash if the model updates during load.

TEST PLAN
  Had a state where my manually saved session would crash systemsettings on load 
  accessing a null kservice object from a menuItem
  
  With this patch that session no longer crashes

REPOSITORY
  R124 System Settings

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24785

AFFECTED FILES
  sidebar/ToolTips/tooltipmanager.cpp

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