Method isCrossThreadStep

src/adapter/threads.ts:1953–1979

* Returns whether the pause event is (probably) from a cross-thread step. * @see https://github.com/microsoft/vscode-js-debug/issues/223

(event: Cdp.Debugger.PausedEvent)

   * @see https://github.com/microsoft/vscode-js-debug/issues/223
   */
  private isCrossThreadStep(event: Cdp.Debugger.PausedEvent) {
    if (!event.asyncStackTraceId || !event.asyncStackTraceId.debuggerId) {
      return false;
    }

    const parent = Thread.threadForDebuggerId(event.asyncStackTraceId.debuggerId);
    if (!parent || !parent._waitingForStepIn?.lastDetails) {
      return false;
    }

    const originalStack = parent._waitingForStepIn.lastDetails.stackTrace;
    return parent._cdp.Debugger.getStackTrace({ stackTraceId: event.asyncStackTraceId }).then(
      trace => {
        if (!trace || !trace.stackTrace.callFrames.length) {
          return false;
        }

        const parentFrame = StackFrame.fromRuntime(parent, trace.stackTrace.callFrames[0], false);
        if (!parentFrame.equivalentTo(originalStack.frames[0])) {
          return false;
        }

        parent._waitingForStepIn = undefined;
        return true;
      },
    );
  }

  /**
   * Based on whether `pause` is true, sets or unsets an instrumentation