[Feature Request] How to show code comparison with only one piece of code

[RenJie-Z]

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

At present, it is necessary to show the code comparison. The interface is not the new code and the old code, but only a piece of code, for example ：
@@ -15,6 +15,7 @@ #include <thread> #include <atomic> #include <ctime> #define MAX_MSG_NUMBER (0xFFFF + 1) @@ -27,17 +28,27 @@ private:

How should the configuration be set