XML code base requires a diff of block-level

Some customers are starting to work with a product which uses XML code, that requires a diff of like 3 or 4 lines as the changes happen on several parts and some cases it is recognized as a new code an not an update, which cause the code to have duplicated entries or when trying to merge, causes conflicts.

Desired results

Have a diff or a way to validate an entire block of several lines, that would help to avoid duplicated entries and increase the versatility od Bitbucket Diffs.