Make jinja_options a dict rather than ImmutaleDict #3190
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This allows changing jinja environment options from the flask app: >>> app.jinja_options['undefined'] = jinja2.ChainableUndefined
clarify docs about when jinja_options can be modified
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This allows changing jinja environment options from the flask app:
The above example will be valid when Jinja2 v2.11 will be released (including pallets/jinja#997)