D22945: Fix --replace option

[Aleix Pol Gonzalez]

apol added inline comments.

INLINE COMMENTS

> broulik wrote in main.cpp:136
> Can you explain? The `ShellCorona` is parented to the app, so is destroyed with it. Is the `deleteLater` even still processed at this point?

aboutToQuit is called much earlier than the actual destruction.

> broulik wrote in main.cpp:182
> So this will just eat CPU until the other process quit?
> Can we register `org.kde.plasmashell` service with `AllowReplace` flag so the new process can just take over?

We can do this change if we get D22946 <https://phabricator.kde.org/D22946> in.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D22945

To: apol
Cc: broulik, plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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