[Merge] lp:~gerboland/qtubuntu/better-input-method-support into lp:qtubuntu

[Lukáš Tinkl]

Review: Approve

Worked flawelessly when testing with the other branch in silo 2481 (https://bileto.ubuntu.com/#/ticket/2481).

Code looks reasonable as well, too bad Qt doesn't have a dedicated OSK window type.
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https://code.launchpad.net/~gerboland/qtubuntu/better-input-method-support/+merge/318163
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