D19904: Prompt user to save/discard changes upon closing config dialog

[Amish Naidu]

amhndu marked 4 inline comments as done.

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D19904

To: amhndu, #dolphin, elvisangelaccio
Cc: ngraham, elvisangelaccio, kfm-devel, alexde, feverfew, meven, spoorun, navarromorales, firef, andrebarros, emmanuelp, mikesomov
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