fix(testing/_diff) Don't merge diff when a token that is surrounded by word-diffs isn't a space #1032
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Thanks to #948 by @lowlighter's great contribution, strings diff of assertion is now very readable.
But I found some edge case that strings diff displays like unwelcome.
It's a feature of merging word diffs if a in-between token is a space. Actually word diffs are merged even when the in-between token is not a space.
For example, this is as expected. Fine.
However, this is not as expected.
And this is also not as expected.
That's the issue. So this PR fixes it not to merge if the in-between token is not a space.
After fixed, above 2 bad examples will be improved as below.