src/vs/workbench/contrib/welcomeWalkthrough/browser/walkThroughPart.ts/WalkThroughPart/clearInput
class WalkThroughPart:	public override clearInput(): void {
		if (this.input instanceof WalkThroughInput) {
			this.saveTextEditorViewState(this.input);
		}
		this.contentDisposables = dispose(this.contentDisposables);
		super.clearInput();
	}