D27037: [Notifications] Fixup setSourceModel

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  Qt says to do a proper model reset in this method.
  I also noticed something funky going on with the `LimitedRowCountProxyModel` not showing any data which went away with this.

TEST PLAN
  5.18

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D27037

AFFECTED FILES
  libnotificationmanager/limitedrowcountproxymodel.cpp
  libnotificationmanager/notificationgroupcollapsingproxymodel.cpp

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