Fixed media pausing behaviour when clicking the conversation list
Fixed media pausing behaviour when clicking the conversation list

This commit changes the inbox to stop video and audio elements when selecting a new conversation, and to not stop such elements when the same
conversation was selected (fixes #391).

// FREEBIE

nrizzio/Signal-Desktop,nrizzio/Signal-Desktop,nrizzio/Signal-Desktop,nrizzio/Signal-Desktop