alt-tab with Bluetooth keyboard locks back button
Using swiftkey with my Bluetooth keyboard works great until I alt-tab from a text input field.
It seems swiftkey gets stuck and none of my back buttons (physical button, mouse right click, and Esc) do anything until I select another text input field and then hit back to close the prediction selection.
If I turn off bluetooth while this is happening the swiftkey keyboard pops up on top of everything. Back buttons are still locked and the only way to hide the keyboard is to click a text input field and hit back.