Squashed commits should be preserved in PR

Squash merge strategy cause that pull requests lost references to squashed commits. I reckon that squash shouldn't affect records in Activity tab because these are important part of development history overview.

Imagine PR where collaborate more developers and each of them creates some commits. By using squash strategy, all these commits get lost (references to them, mentions in activity) and PR only refers to new single commit.

Both GitLab and GitHub preserve squashed commits and would be really nice and useful if Bitbucket did so as well.