D7714: Show dialog to ask when closing when more than tab open

[Albert Astals Cid]

aacid created this revision.
Restricted Application added a subscriber: Okular.
Restricted Application added a project: Okular.

REVISION SUMMARY
  The checkbox is checked and says "Warn me on closing more than one tab",
  for that reason we can't use the default KMessageBox::questionYesNo since
  there the checkbox is always not checked and it's when checked that you enable it
  
  Inspired by code from torham zed torhamzed at yahoo.com at review request 126406

REPOSITORY
  R223 Okular

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7714

AFFECTED FILES
  shell/shell.cpp

To: aacid
Cc: #okular, aacid
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