I have been able to change the background color after installing the updates by changing
Tool / Options / Environment / Text Editor / Highlight Current Line (Active
Seems to be this behavior was fixed since original answer was written. So answer needs update and here it is:
https://visualstudio.uservoice.com/forums/121579-visual-studio/suggestions/3012415-remove-the-light-border-around-highlight-current
You can remove the border by matching the Background color of the
Highlight Current Line (Active) setting in Fonts and Colors to the
Foreground color. This is a simple customization.
Go to Tools > Options > Environment > Fonts and Colors and look there for Highlight Current line, active and inactive. To remove border as described by VS team by link and cite above.
