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

[Daniel d'Andrada]

Review: Needs Fixing

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.

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