Comment 5 for bug 1163371

To confirm the previous comment, here is an extract from the QInputMethod::hide() documentation:
"Normally applications should not need to call this function, keyboard should automatically close when the text editor loses focus, for example when the parent view is closed."

http://qt-project.org/doc/qt-5.0/qtgui/qinputmethod.html#hide

Looking at the code of TextInput, there is no call to hide() at any point, only calls to show().