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due to planed History Tab in editor view it is necessary in GsfDataObject.GenericEditorSupport.createPane() to obtain the information if the registered language is meant to have editors as a multiview a possible solution would be to add boolean useMultiview() default false; into @LanguageRegistration see attached patch...
Created attachment 108926 [details] patch
will integrate tomorrow, in case no objections are raised
fixed core-main #ca6a9f6907b1