Bug#843418: menus do not appear on high-DPI display

I’m using X.org and the default GTK+ theme, which I think is Adwaita: $ gsettings get org.gnome.desktop.interface gtk-theme 'Adwaita'

Bug#843418: menus do not appear on high-DPI display

Are you using X.org or Wayland, and which GTK+ theme?

Bug#843418: menus do not appear on high-DPI display

Package: libgtk-3-0 Version: 3.22.2-1 Severity: important GTK3 applications fail to show menus. Instead, a single white pixel appears in the upper-left corner of the screen. The issue is visible in . (I added the grey border for visibility; in reality,