[Merge] lp:~azzar1/unity/properly-handle-copy-dialog into lp:unity

[Amr Ibrahim]

The related bugs were reported against Xenial but there were not fixed there. Please push this fix to Xenial. Users are still affected in 16.04. Have a look at bug #1399077 and its duplicates.
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https://code.launchpad.net/~azzar1/unity/properly-handle-copy-dialog/+merge/299301
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