There are a few interactions in Photos.app on Mojave that I think are pretty bad. This is probably the worst one. Please take a look and consider adding input.
OS: MacOS Mojave Beta 2
In the Photos app, hitting the space bar on a thumbnail of a photo will open the image in a large view. Hitting the space bar again will play the Live Photo (if applicable)
Challenges with this interaction
* There is no feedback for photos that have no Live Photo such as screenshots, exported, or downloaded images
* This conflicts with a behavior users are accustomed to with finder, where hitting space bar will open a preview and hitting it again will dismiss it
Revert this interaction back to opening to a large photo on space bar input and dismissing on subsequent input