src/vs/workbench/api/common/extHostWebviewPanels.ts/ExtHostWebviewPanel/viewColumn
class ExtHostWebviewPanel:	get viewColumn(): vscode.ViewColumn | undefined {
		this.assertNotDisposed();
		if (typeof this.#viewColumn === 'number' && this.#viewColumn < 0) {
			// We are using a symbolic view column
			// Return undefined instead to indicate that the real view column is currently unknown but will be resolved.
			return undefined;
		}
		return this.#viewColumn;
	}