[Bug 309356] New: Display settings. Revert to previous configuration doesn't revert the settings

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https://bugs.kde.org/show_bug.cgi?id=309356

            Bug ID: 309356
          Severity: normal
           Version: 4.8.5
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: Display settings. Revert to previous configuration
                    doesn't revert the settings
    Classification: Unclassified
                OS: Linux
          Reporter: underline at list.ru
          Hardware: Ubuntu Packages
            Status: UNCONFIRMED
         Component: general
           Product: systemsettings

When user selects some display resolution and presses Accept configuration the
dialog view with progress bar shows up, that allows the user to apply the
settings or revert them. Also user can just wait and the settings will be
reverted automatically. The same behavior should be, when user presses Revert
to previous configuration, but it is not. When user presses that button the
configuration is just reverted on the system settings window, but the old
display settings remain until user presses Apply.

If someone messed up with resolutions and cannot see anything, they cannot do
anything but wait. If user presses Escape then Revert to previous configuration
is applied, so they can't return the system to it's previous state (because
they cannot see anything), unless they know the shortcut for the Apply button.

Reproducible: Always

Steps to Reproduce:
1. System Settings -> Display and Monitor
2. Change some resolution
3. On the popup click Revert to previous configuration
Actual Results:  
The settings are reverted just on the view but not applied.

Expected Results:  
The settings should be applied.

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