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2b0c59baa2
Some keyboards come with a zoom see-saw or rocker which until now got mapped to the Linux "zoomin/out" keys in hwdb. However, these keycodes are not recognized by any major desktop. They now produce Up/Down key events so that they can be used for scrolling. The internet is full of instructions how to "unbreak" these keys, e. g. https://askubuntu.com/questions/471802/make-the-zoom-slider-of-microsoft-natural-ergonomic-keyboard-4000-and-7000-scrol https://unix.stackexchange.com/questions/322075/how-to-get-ms-natural-ergonomic-4000-slider-work-on-linux-mint So let's make it official. But keep their physical meaning in comments in case desktops start to do something useful with them at some point. Thanks to Finn Christiansen for the original patch! Replaces #6953