B:BD[
2.165] → [
2.165:237]
button(ui_state, 'undo', {x=bside-w-10, y=5, w=w, h=Line_height+10,
local ux, uy = left+lw*side+10, top+10
if Safe_width < Safe_height then
ux, uy = left+lw*side-w-10, top+lh*side+10
end
button(ui_state, 'undo', {x=ux, y=uy, w=w, h=Line_height+10,