VS Code :: Cannot edit in read-only editor when Compare Selected

I'm using VS Code 1.140.1 on MacOS Catalina and I need to compare two files.

1. I open both files with VS Code
2. I select both
3. I right click on them and I select "Compare Selected"

The comparison works but when I try to edit while comparing I cannot, VS Code says: "Cannot edit in read-only editor".

That is a bit frustrating because other IDE like Notepad++ they indeed allow you to edit while comparing and this is very useful as it shows you when the 2 files are the same.

Is there any way around?

Or do you suggest to change VS Code with another IDE?