code: def _pre_action(self) -> None:
      bottom_margin = self.data.get("bottom_margin")
      if self.data.get("x_axis_label") and (
          not bottom_margin or bottom_margin == "auto"
      ):
          self.data["bottom_margin"] = 30
  
      if x_ticks_layout := self.data.get("x_ticks_layout"):
          self.data["x_ticks_layout"] = (
              45 if x_ticks_layout == "45°" else 0
          )
  
      # Truncate y-axis by default to preserve layout
      self.data["y_axis_showminmax"] = True
  
imports: from typing import Any
  from superset.utils.core import as_list
  from .base import MigrateViz
label_desc: Use image node_id 1 for calling the MigrateBubbleChart obj's underlying member method code with example usage: obj._pre_action() without return types