class_docstr: Hold config parsers for all idle config files in singleton instance.
  
  Default config files, self.defaultCfg --
      for config_type in self.config_types:
          (idle install dir)/config-{config-type}.def
  
  User config files, self.userCfg --
      for config_type in self.config_types:
      (user home dir)/.idlerc/config-{config-type}.cfg
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docstr: Return dict: {configurable extensionName event : active keybinding}.
  
  Events come from default config extension_cfgBindings section.
  Keybindings come from GetCurrentKeySet() active key dict,
  where previously used bindings are disabled.
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code: def GetExtensionKeys(self, extensionName):
      """Return dict: {configurable extensionName event : active keybinding}.
  
      Events come from default config extension_cfgBindings section.
      Keybindings come from GetCurrentKeySet() active key dict,
      where previously used bindings are disabled.
      """
      keysName = extensionName + "_cfgBindings"
      activeKeys = self.GetCurrentKeySet()
      extKeys = {}
      if self.defaultCfg["extensions"].has_section(keysName):
          eventNames = self.defaultCfg["extensions"].GetOptionList(
              keysName
          )
          for eventName in eventNames:
              event = "<<" + eventName + ">>"
              binding = activeKeys[event]
              extKeys[event] = binding
      return extKeys
  
imports: from configparser import ConfigParser
  import os
  import sys
  from tkinter.font import Font
  import idlelib
label_desc: Use image node_id 16 for calling the IdleConf obj's underlying member method code with example usage: obj.GetExtensionKeys(extensionName) and returns: extKeys