src/vs/workbench/contrib/webviewPanel/browser/webviewEditor.ts/WebviewEditor/setEditorVisible
class WebviewEditor:	protected override setEditorVisible(visible: boolean, group: IEditorGroup | undefined): void {
		this._visible = visible;
		if (this.input instanceof WebviewInput && this.webview) {
			if (visible) {
				this.claimWebview(this.input);
			} else {
				this.webview.release(this);
			}
		}
		super.setEditorVisible(visible, group);
	}