[stable30] fix(addContent): only process addExtensions once #6605
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Backport #6602.
Use
editor.options.extensions
.This only includes the extensions that were configured
when instantiating the editor.
It does not include the extensions these extensions added.
generateJSON
will process the provided extensionsand add extensions according to their
addExtensions
field.Before we used
editor.editorManager.extensions
which includes all extensions used in the editor
including those added by other extensions.
This lead to
generateJSON
adding the same extensions againwhich resulted in a warning.