Video button is not selected when double clicked
This is a minor issue which affects the operation of cheese when double clicking buttons instead of single clicking.
When single clicking the photo button, the button is clearly selected.
When single clicking the video button, the button is also clearly selected.
When double clicking the video button it is not clear which button has been selected as all buttons are showing as being deselected but cheese is ready to record video as the the timer is now displayed.
This issue was originally reported at https://bugs.launchpad.net/bugs/1478088 against cheese 3.16.1 by another user.
I can confirm this issue with cheese 3.28.0 in Ubuntu 18.04 and cheese 3.30.0 in Fedora 29.