snap.love/0011-box_height

box_height = function(node)
	-- return the height of a text editor node (explicit width). The result is scaled.
	local count = 0
	for i=1,#node.editor.lines do
		local line = node.editor.lines[i]
		if node.editor.line_cache[i] == nil then
			node.editor.line_cache[i] = {}
		end
		node.editor.line_cache[i].screen_line_starting_pos = nil
		Text.populate_screen_line_starting_pos(node.editor, i)
		count = count + #node.editor.line_cache[i].screen_line_starting_pos
		Text.clear_screen_line_cache(node.editor, i)
	end
	print(count, '*', node.editor.line_height, '=', count*node.editor.line_height)
	return count*node.editor.line_height/Viewport.zoom
end