src/vs/editor/browser/widget/diffNavigator.ts/DiffNavigator/_onDiffUpdated
class DiffNavigator:	private _onDiffUpdated(): void {
		this._init();

		this._compute(this._editor.getLineChanges());
		if (this.revealFirst) {
			// Only reveal first on first non-null changes
			if (this._editor.getLineChanges() !== null) {
				this.revealFirst = false;
				this.nextIdx = -1;
				this.next(ScrollType.Immediate);
			}
		}
	}