It would be great if it was possible to directly edit files in compare window. While there are external tools which allow this, it is not possible to use easily and directly such tools when comparing the current file in editor with the latest disk version.
P.S.: I know that programming that would be a lot of work... -- <https://forum.pspad.com/read.php?2,76262,76262> PSPad freeware editor https://www.pspad.com