QCamera stops working entirely if device is disconnected

Under certain scenarios, a QCamera instance will become entirely unusable, even if you try to switch camera-device. This can happen if you either try to select a camera-device that is not currently connected, or if you disconnect a camera-device while it is active. In these cases, the QCamera will become unable to establish a new feed on different camera-devices even if they are currently connected, and will be stuck in the last frame.

Steps to reproduce:

1. Have at least one camera-device connected, such that QMediaDevices::videoInputs.length() > 0
2. Create a QCamera instance
3. Set QCamera to your camera-device
4. Set it to active
5. Disconnect the active camera-device (i.e unplug the physical cable)
6. Select another connected camera-device

What I expect to happen:
I expect to get a working camera-feed on the newly selected camera-device.

What actually happens
The new camera-feed never starts on the newly selected camera-device.