Review Request 117499: Fix showing the user switchting dialog a second time in the screen locker

[Felix Geyer]

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https://git.reviewboard.kde.org/r/117499/
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Review request for Plasma.


Bugs: 331761
    http://bugs.kde.org/show_bug.cgi?id=331761


Repository: kde-workspace


Description
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The user switichting dialog from the screen locker is destroyed when the cancel button is pressed.
As a result you can't open it again.

The screen locker uses a PlasmaComponents.PageStack to show the password input and user switching dialogs.
When a dialog is popped from the stack it is destroyed by PageStack.

This change fixes this by creating a new instance of userSessionsUI before it is pushed to the stack.
Additionally the switchUserEnabled property is set once when the screen locker is created as userSessionsUIInstance
doesn't always exist. 


Diffs
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  ksmserver/screenlocker/greeter/themes/org.kde.passworddialog/contents/ui/main.qml 0d3c7d5 

Diff: https://git.reviewboard.kde.org/r/117499/diff/


Testing
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- Lock the screen
- Press "Switch user"
- Press "Cancel"
- With this patch the "Switch user" button is visible and functional.


Thanks,

Felix Geyer

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