Line highlighting behavior doesn't match that of `cmd+l` (`Expand Line Selection`)

[gw]

VSCode's built-in cmd+l functionality, Expand Line Selection, highlights lines like this:

...that's what it looks like after pressing cmd+l once to highlight a single line. However, if you invoke Open in GitHub: File at this point, the cursor's line is added to the range, and two lines appear highlighted:

...but I would expect it only include one line, like this:

...since I only pressed cmd+l once, to highlight a single line.

I would maybe expect the current behavior if I also had "openInGitHub.useLocalLine": true, but I do not.