`commit_diff_loader` panic

I experienced a crash when doing an interactive rebase. This was the truncated message that appeared at the bottom of the screen: ``` thread 'core process' panicked at src/git/commit_diff_loader.rs:139:10: diff.foreach failed. Please report this as a bug.: Error { code: -1, klass: 10, message: "invalid data in index - calculated checksum doe ``` I can't reproduce the crash, but what I did was: 1. Move a commit from the middle to the top of the list 2. Change it to a fixup 3. Insert a break after that commit 4. Search for a word that appeared in the commit I moved