Weird diff result

[alexdima]

Extracted from #9012 (comment)

@alexandrudima Not sure if it is expected, why does the additional space in the second line in the following diff is not highlighted

[sbatten]

When verifying, I found this case where the fourth line claims it preserves some spaces on the left but are all highlighted on the right.

[alexdima]

Here is a Copy-Paste friendly version of the screenshot above

   farst line
sacond line   
thard line
   faurth   line   

first line   
   second    line
third line   
      fourth     line     

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The diff algorithm matches the 3 spaces on original line 4 with the spaces on modified line 3. i.e.

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This is expected, as the character level diffing runs on multiple lines. Here is a clearer example:

hello my dear world

hello my 
lovely world

IMHO this is a good thing, as it allows me to see that "dear" was replaced with "lovely" and a newline was added

[sbatten]

thanks for the explanation. I agree, I just missed the transferring of spaces and thought there could be a deeper issue.