Shared Element Transition sometimes loses place when reentering main activity from comments activity

[avitaker]

Shared element name seems to be lost from the listing item view when coming back from comments activity, and the result is that the shared element just floats at the top of the screen while the main activity reenters.

To recreate

• Load a subreddit's posts.
• Click on a post to open comments.
• Click on the FAB to open the post link in the browser.
• Navigate back to the app.
• Hit the back button.