Frequently, I use the “New Editor” feature to copy or code from one part of a file to another. It works well if I only add or delete lines in the part with the higher sequence numbers.
If I add or delete lines to the copy with lower line numbers, it adjusts the other copy to display the same line number previously shown at the top. This means that I have to move that display to show the part of the code I’m editing, especially a pain if it’s more that about 10 lines.
It would be far better to adjust the expected line number in the copy by the number of lines added or deleted above the displayed code and to keep the same code at the top of the editor with the higher-numbered lines.