Wait for window.monacoEditorInstances #429
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Making this a draft because I'd like to find a better, fix but also don't want to lose this in case this ends up being the best option.
When loading a CKEditor config in a slideout, sometimes (potentially only in Firefox) the module script in
_edit.twigcan be executed beforewindow.makeMonacoEditorhas been called and thewindow.monacoEditorInstancesobject established. In those cases, you'll get awindow.monacoEditorInstances is undefinedtype error, and the config editor won't load.