D16376: [tabswitcher] Fix beginRemoveRows call

[David Edmundson]

davidedmundson created this revision.
davidedmundson added a reviewer: Kate.
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REVISION SUMMARY
  To remove one row first and last should be the same index.
  
  This hit an assert on newer Qt.

TEST PLAN
  I hit this booting up with no args with kate
  restoring to split views each with one document.
  
  From the calling code it seems to be trying to just remove one row.
  
  It now starts. Hitting control+n, control_w does add/remove tabs respectively

REPOSITORY
  R40 Kate

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D16376

AFFECTED FILES
  addons/tabswitcher/tabswitcherfilesmodel.cpp

To: davidedmundson, #kate
Cc: kwrite-devel, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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