Skip resolving save conflict when the contents between disk and editor are equal

[LordXerus]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.97.2
• OS Version: Windows_NT x64 10.0.19044

Steps to Reproduce:

1. Create new file
2. Write contents (In my example I used test)
3. Save file
4. Make a change to file (In my example I appended r)
5. Make the same change externally (To simulate an external tool like git stash pop)
6. Try to save file in VSCode
7. Result: VSCode asks to resolve save conflict even when the files are same

Kind of harmless bug, but should be an easy fix.

[bpasero]

Related: #919

But this idea is really genius, not sure why I never had thought about 👏