I have no clue what this line means, how it got there, or how to remove it.
Currently, as you may already know, there is an option to "disable" the green squiggles - Tools > Options > Text Editor > C/C++ > Advanced > "Disable Code Analysis Squiggles".
Green: The line has been changed and saved. Orange: The line has been changed, saved, and the change undone.
If the start window is not open, choose File > Start Window. On the start window, choose Create a new project. On the Create a new project window, enter, or type console in the search box. Next, choose Visual Basic from the Language list, and then choose Windows from the Platform list.
The colored lines on the side of the Visual Studio text editor display lines that have changed since open and are unsaved (yellow) or saved (green).
It's a handy way to quickly tell what changes you've made to the file at a glance. However if you want to turn it off you can toggle it by going to Tools
-> Options
-> Text Editor
and unchecking Track Changes
.
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