When viewing an interdiff, indentation changes wouldn't show up. If the

only changes made to a file were indentation-related, the file would

display only the last few lines of context, along with a banner stating

"This file contains only whitespace changes."
This was due to a strict check against an opcode tag of equal,

which should have allowed for filtered-equal as well.
We now check both, and split off new equal ranges for anything

containing indentation changes, ensuring they're highlighted. All other

filtered-equal ranges will remain.

Viewed an interdiff where nothing but indentation changes and trailing

whitespace had changed. Saw that those chunks were visible in the diff

viewer.