Use fieldset id instead of the title in Form when rendering the Field…

… component

docs/source/upgrade-guide/index.md

@@ -218,6 +218,14 @@ The `.stories.mdx` extension is no longer supported.
 Although it is technically possible to keep the old version running, the script `volto-update-deps` will try to update to Storybook 8 every time you run it.
 ```
 
+### Form component passes down the id of the current fieldset
+
+There was a bug that was provoking to have `id` attributes with spaces on it, if the a fieldset was longer than one word.
+This was because the fieldset `title` was passed down.
+The fieldset `id` is passed now instead of the `title`.
+If you are relying on this for selecting fields by `id`, could be that tests could break.
+If that's the case you should amend them to use the `id`.
+
 (volto-upgrade-guide-17.x.x)=
 
 ## Upgrading to Volto 17.x.x

packages/volto/src/components/manage/Form/Form.jsx

@@ -843,7 +843,7 @@ class Form extends Component {
                             {...schema.properties[field]}
                             id={field}
                             formData={formData}
-                            fieldSet={item.title.toLowerCase()}
+                            fieldSet={item.id}
                             focus={this.state.inFocus[field]}
                             value={formData?.[field]}
                             required={schema.required.indexOf(field) !== -1}