[Merge] lp:~osomon/webbrowser-app/use-qtsystems into lp:webbrowser-app

[Olivier Tilloy]

Review: Needs Fixing

Testing this branch on MX4, I’m seeing the following error in the logs when connecting a bluetooth keyboard/mouse combo to the device:

QObject: Cannot create children for a parent that is in a different thread.
(Parent is QInputInfoManagerMir(0xaa09a6ac), parent's thread is QThread(0x1fba0b8), current thread is QThread(0xb08612d8)

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https://code.launchpad.net/~osomon/webbrowser-app/use-qtsystems/+merge/309667
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