D12240: Save the dialog view settings when closing the dialog without hitting the cancel button

[Nathaniel Graham]

ngraham removed a dependency: D12239: Create a public writeViewConfig() 
function so the open/save dialog itself can call it.

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REPOSITORY
  R135 Integration for Qt applications in Plasma

REVISION DETAIL
  https://phabricator.kde.org/D12240

To: ngraham, #frameworks
Cc: anthonyfieroni, elvisangelaccio, plasma-devel, ragreen, Pitel, ZrenBot, 
lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart