Port one of session management connections state to a custom API
Summary: Currently kwin opens a second ICE connection to ksmserver in order to tell the state of kwin's whether we're logging out and saving clients or not. This requires that kwin launches after ksmserver to have the connection which is a dependency I want to break. Practically this code is already ksmserver specific as it relies on some custom code that sends the first saveState request to kwin first. Instead we can replace it with a bespoke IPC over DBus and siplify the code both end. This will allow several other future enhancements that we want with regards to handling the session state, as well as make an effort platform agnostic session management, as well as cleaning up some complex code. Ksmserver calls into kwin, rather than having kwin watch ksmserver state to allow us make sure it's race free. Reviewers: #kwin, zzag Reviewed By: #kwin, zzag Subscribers: romangg, zzag, kwin Tags: #kwin Differential Revision: https://phabr...
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