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For resize() to work, we'll need to initialise g_side in globals.js.

var g_side=0;

And here's my resize function:

function resize() {
var side=45*vmin();
if (side!=g_side) setup();
}

We should also cancel any timer that is in operation. The clearTimeout function is available for this purpose but we need to tell it which timer.
Three changes are necessary:

in globals.js:

var g_timer;

in one_step():

if (g_i<4) g_timer=setTimeout(one_step,200);

in setup():

function setup() {
clearTimeout(g_timer);
...
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