Auto-completion sometimes shows duplicated entries

[AlexanderWert]

Sometimes the popup for the auto completion in the config UI shows duplicated entries:

[JonasKunz]

I guess I found the root cause in OcelotAutoCompleter.js:

export const enableOcelotAutocompletion = (aceEditor) => {
  if (!initialized) {
    const langTools = ace.require('ace/ext/language_tools'); // eslint-disable-line no-undef
    langTools.addCompleter(completer);
  }
  aceEditor.configAutoCompleteEnabled = true;
};

We check the initialized flag, but never set it.
This function is called whenever the Editor is created, causing the autocompleter to be registered multiple times.