Selecting a camera causes initial, autoselected camera to vanish from device list

[TristanHodgins]

Describe the bug
I am using multiple OAK-D cameras (2 OAK-D Pro W PoEs and 1 OAK-D Long Range) all connected to my computer through a POE switch. When I boot up depthai-viewer, it will select one of the cameras to view. If I go to the camera selection menu, I can succesfully select a different camera to view, however, the one that was initially selected will no longer appear in the drop-down menu until the viewer is rebooted.

To Reproduce
Steps to reproduce the behavior:

1. Connect multiple cameras to your computer through a POE switch.
2. Load up depthai-viewer
3. In the device settings tab, go to the camera select menu
4. Select a different camera, wait for the pipeline to update
5. In the device settings tab, go again to the camera select menu
6. Observe that your original camera is not listed

Expected behavior
I would expect that the initally selected camera apears in the drop down menu

Desktop (please complete the following information):

• OS: Linux 22.04.5

[zrezke]

Hey @TristanHodgins
New cameras are only queried when no device is selected (because there would be some stuttering happening every two seconds if we were to query the devices (even in a thread)).
A scan for new devices will happen continuously only when "No device" is selected.

I agree that the behavior is not what a user would expect. Any fixes welcome ;) but for now we won't fix it