[Merge] lp:~mir-team/qtubuntu/port-to-mirclient into lp:qtubuntu

[Albert Astals Cid]

Review: Needs Information

	- if (ubuntuEvent->window->window() == nullptr) {
	+ if (ubuntuEvent->window == nullptr) {

Should the second one be 

  if (ubuntuEvent->window == nullptr || ubuntuEvent->window->window() == nullptr) {

To also cover what the previous check was doing?
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https://code.launchpad.net/~mir-team/qtubuntu/port-to-mirclient/+merge/245164
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