Fix data-diff first line bug

[fry69]

Fix #56

• diff symbol renders now inside the code block for the first line
• added example for diff on the first line
• tests desperately needed

I am happy with this so far, awaiting comments.

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[fry69]

No clue how to fix this, I did not touch anything knowingly that could provoke an Ember is not defined error. Please enlighten me.

Built project successfully. Stored in "/tmp/tests-dist-2023722-1936-1ggxhms.oalu".
not ok 1 Chrome 115.0 - [undefined ms] - Global error: Uncaught ReferenceError: Ember is not defined at http://localhost:7357/assets/vendor.js, line 3860
    ---
        browser log: |
            {"type":"error","text":"Uncaught ReferenceError: Ember is not defined at http://localhost:7357/assets/vendor.js, line 3860\n","testContext":{}}

[mansona]

This is an amazing change 🎉 thanks for the change. I would love you to remove the (?bug) comment but it's not a requirement for merging 👍

[mansona]

@fry69 regarding the Embroider error, you can ignore it. It's because of a new embroider feature that was recently added in embroider-build/embroider#1521

I will fix that at a later date, and it's nothing that you have done to cause that issue