D17599: Confirm closing if multiple tabs are open.

[Shubham]

shubham added a reviewer: sars.

REPOSITORY
  R40 Kate

REVISION DETAIL
  https://phabricator.kde.org/D17599

To: shubham, dhaumann, #kate, cullmann, sars
Cc: pino, kwrite-devel, hase, michaelh, ngraham, demsking, cullmann, sars, dhaumann
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