haven't seen much about this in the usual news, so an official WTH: Both #Gnome and #Firefox are about to simply delete middle-mouse-button paste because
"This is an X11ism, originally an xsetting 1 which frequently results is in unexpected behavior when people pressing the middle mouse button."
So extremely (and I mean EXTREMELY!) useful features that have been around for decades get dropped because some people accidentally pressed the middle mouse button ...
https://www.theregister.com/2026/01/07/gnome_middle_click_paste/