src/vs/editor/browser/config/fontMeasurements.ts/FontMeasurementsImpl/_writeToCache
class FontMeasurementsImpl:	private _writeToCache(item: BareFontInfo, value: FontInfo): void {
		this._cache.put(item, value);

		if (!value.isTrusted && this._evictUntrustedReadingsTimeout === -1) {
			// Try reading again after some time
			this._evictUntrustedReadingsTimeout = window.setTimeout(() => {
				this._evictUntrustedReadingsTimeout = -1;
				this._evictUntrustedReadings();
			}, 5000);
		}
	}