global-hl-line-sticky-flag

global-hl-line-sticky-flag is a variable defined in `hl-line.el'.
Its value is

nil

Documentation:
Non-nil means the Global HL-Line mode highlight appears in all windows.
Otherwise Global Hl-Line mode will highlight only in the selected
window. Setting this variable takes effect the next time you use
the command `global-hl-line-mode' to turn Global Hl-Line mode on.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.