See #1154382-99: View mode no longer can be changed and following.
We have a number of change records which have "8.x, 7.x" or the other way as branch. However, the exposed filter is currently set to Equals, which means that searching for 8.x isn't going to find them. I think it would be useful to change the exposed filter to CONTAINS.
This might not be the right issue queue, feel free to move this wherever it belongs.