sokoban.love/0036-adjust_scrollbar

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adjust_scrollbar = function(state, y)
local s = (y-state.top) / (state.bottom-state.top)
local screen_line = s*state.screen_line_count
local line = 1
for i=1,#state.lines do
if state.line_cache[i].start_screen_line_index > screen_line then
break
end
line = i
end
state.screen_top1 = {line=line, pos=1}
state.cursor1 = {line=line, pos=1}
end