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b1ffa9a9d7
This patch adds support for <optgroup>s in FilteredSelectMultiple widgets. When a popup returns a new object, if the source field contains optgroup choices, the optgroup is now also included in the response data. Additionally, this adds error handling for invalid source_model parameters to prevent crashes and display user-friendly error messages instead. Co-authored-by: Michael McLarnon <mmclar@gmail.com>
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