in scripts/platform-content-handler.js [284:291]
function refreshPlaygroundSamples() {
document.querySelectorAll('code.runnablesample').forEach(node => {
const playground = node.KotlinPlayground;
/* Some samples may be hidden by filter, they have 0px height for visible code area
* after rendering. Call this method for re-calculate code area height */
playground && playground.view.codemirror.refresh();
});
}