[Merge] lp:~nick-dedekind/qtubuntu/1623861.window-focus into lp:qtubuntu

[Nick Dedekind]

> Looks good. just one minor thing:
> 
> """
> // Mir may have sent a pair of focus lost/gained events, so we need to "peek"
> into the queue
> // so that we don't deactivate windows prematurely.
> """
> 
> Please move that comment from UbuntuInput to UbuntuWindow as well (instead of
> just deleting it). This mPendingFocusGainedEvents scheme is non-obvious and
> thus deserves a comment.

Done

> 
> Your commit message is also too vague. What you did was making the focus-
> change optimization logic support multiple windows (by moving it to
> UbuntuWindow and thus making it per-window).

Done
-- 
https://code.launchpad.net/~nick-dedekind/qtubuntu/1623861.window-focus/+merge/306318
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