some updates on screen locking related things

[Aaron J. Seigo]

hi ...

as promised, i collected the ideas for screen locking in Plasma Workspaces 2 
on the wiki:

	http://community.kde.org/Plasma/screenlocker

further comments, ideas, etc. are welcome and I expect that those points will 
refine considerably over time.

also, in the aseigo/qmlkrunner branch of kde-workspace i pushed some changes 
yesterday that add a switchUser dbus API to ksmserver. now when switch user is 
called, the screen first locks and then shows the switchUser UI.

this brings a few subtle changes:

* it relies on the theme to have a switch user UI. if it doesn't ... the 
screen just locks. there is currently no way for external components (e.g. 
kickoff or other launchers) to know that this is the case and to therefore hide 
the user switching feature if the locker doesn't provide it. right now that is 
a hypothetical situation only, but will need addressing at some point.

* the screen locks. :) previously, one would pick an existing session or 
approve starting a new one and then it would go through the whole process. now 
the screen locks first ... even if you change your mind and hit 'cancel', you 
have to enter your password to get back to the desktop. i'm still debating 
whether or not this is actually a problem or not.

it's still a work in progress, so input is welcome.

-- 
Aaron J. Seigo
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