#192 Taking a photo with the volume keys

[Marcin Mielniczuk]

It's much easier to keep the device motionless when releasing the volume button than when pressing it. Hence, it should be possible to trigger the photo on release as opposed to pressing the volume key.
In this case, holding the volume button should trigger focus.

It's the way the stock Samsung Galaxy J7 camera works and a similar app for MeeGo Harmattan OS, cameraplus.