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

[Nathaniel Graham]

ngraham created this revision.
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REVISION SUMMARY
  D12227 <https://phabricator.kde.org/D12227> fixes 209559 for the case when the user presses the Cancel button, but not when the dialog is closed via the Escape key or the titlebar's close button. In order to do that, changes to the QPA plugin are needed. To facilitate it, `KFileWidget` needs a public interface to the `writeViewConfig()` function needs so that the dialog can call it. THis patch does that.

TEST PLAN
  Compile and deploy KIO, run tests (no regressions),  interact with a file open/save dialog; all still work

REPOSITORY
  R241 KIO

BRANCH
  public-writeviewconfig-function

REVISION DETAIL
  https://phabricator.kde.org/D12239

AFFECTED FILES
  src/filewidgets/kfilewidget.cpp
  src/filewidgets/kfilewidget.h

To: ngraham, #frameworks
Cc: michaelh, ngraham, bruns
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