docstr:     Get thumbnail screenshot has BytesIO from cache or fetch
  
  :param user: None to use current user or User Model to login and fetch
  :param cache: The cache to use
  :param thumb_size: Override thumbnail site
docstr_tok: ["Get","thumbnail","screenshot","has","BytesIO","from","cache","or","fetch",":","param","user",":","None","to","use","current","user","or","User","Model","to","login","and","fetch",":","param","cache",":","The","cache","to","use",":","param","thumb_size",":","Override","thumbnail","site"]
code: def get(
      self,
      user: User = None,
      cache: Cache = None,
      thumb_size: WindowSize | None = None,
  ) -> BytesIO | None:
      """
          Get thumbnail screenshot has BytesIO from cache or fetch
  
      :param user: None to use current user or User Model to login and fetch
      :param cache: The cache to use
      :param thumb_size: Override thumbnail site
      """
      payload: bytes | None = None
      cache_key = self.cache_key(self.window_size, thumb_size)
      if cache:
          payload = cache.get(cache_key)
      if not payload:
          payload = self.compute_and_cache(
              user=user, thumb_size=thumb_size, cache=cache
          )
      else:
          logger.info("Loaded thumbnail from cache: %s", cache_key)
      if payload:
          return BytesIO(payload)
      return None
  
imports: from __future__ import annotations
  import logging
  from io import BytesIO
  from typing import TYPE_CHECKING
  from flask import current_app
  from superset import feature_flag_manager
  from superset.utils.hashing import md5_sha_from_dict
  from superset.utils.urls import modify_url_query
  from superset.utils.webdriver import ChartStandaloneMode, DashboardStandaloneMode, WebDriver, WebDriverPlaywright, WebDriverSelenium, WindowSize
label_desc: Use image node_id 5 for calling the BaseScreenshot obj's underlying member method code with example usage: obj.get(user, cache, thumb_size) and returns: None, BytesIO