Right now gtkstackswitcher.c's "update_button" function sets a size-request of 100px width for the stack switcher buttons (but only if they don't contain icons?). Depending on DPI, etc., this kind of hard-coded pixel value may be incoherent, and the intended purpose (making switchers homogeneous?) is better achieved through the existing GtkContainer API. In certain cases this can waste a lot of space and it's confusing to have hard-coded pixel values from the toolkit interfere when trying to design themes and debug widget layout.