src/vs/workbench/contrib/debug/browser/variablesView.ts/VariablesView/onMouseDblClick
class VariablesView:	private onMouseDblClick(e: ITreeMouseEvent<IExpression | IScope>): void {
		const session = this.debugService.getViewModel().focusedSession;
		if (session && e.element instanceof Variable && session.capabilities.supportsSetVariable) {
			this.debugService.getViewModel().setSelectedExpression(e.element);
		}
	}