↳ In-reply-to » X11’s WM_NORMAL_HINTS property is a property that can be set on a window. Part of that property is width_inc and height_inc. They tell the window manager to only increase/decrease a window’s size by certain steps.

Forgot to link the docs, here it is:

https://www.x.org/releases/current/doc/libX11/libX11/libX11.html#Setting_and_Reading_the_WM_NORMAL_HINTS_Property

(Nope, that’s not Twitter.)