* [x] Use a counter as the transition name in `AttachmentItem`. * [x] Tapping partly covered images makes them pop up from under the cover which looks glitchy * [ ] Under mysterious circumstances messages can overlap each other (or leave gaps) after a return transition to the conversation * [x] On Moto G 4G (API 22), the exit transition still uses sliding * [x] Fix shared element exit transition when the list position is lost (activity was stopped or made into fullscreen) * [ ] ~~Change shared element of return transition when fullscreen view was swiped to another image when returning~~ * [x] Return transition lands slightly below thumbnail when status bar is hidden Subtask of #1237.