I'm still using a touchpad, with "legacy" (not natural) scrolling. For me the command
xmodmap -e 'pointer = 1 2 3 5 4'
effects (switches to natural scrolling) firefox, xterm, urxvt, terminology; but keeps legacy scrolling in chromium, gnome-terminal, nautius, gedit, konsole.
Sounds like a generic Gtk+/Qt or GNOME/KDE issue. Or something even weirder. Note that Chromium belongs to a different team for you than for me. Could be a version difference, or could be due to mouse vs. touchpad. It's totally crazy.
I'm still using a touchpad, with "legacy" (not natural) scrolling. For me the command
xmodmap -e 'pointer = 1 2 3 5 4'
effects (switches to natural scrolling) firefox, xterm, urxvt, terminology; but keeps legacy scrolling in chromium, gnome-terminal, nautius, gedit, konsole.
Sounds like a generic Gtk+/Qt or GNOME/KDE issue. Or something even weirder. Note that Chromium belongs to a different team for you than for me. Could be a version difference, or could be due to mouse vs. touchpad. It's totally crazy.