I have tested this item ✅ successfully on 5284d05

I would not do that in JForm itself but on the place where the load function is called. I'm not sure if the change on JForm will have some unpredictable side effects.

@laoneo, I was thinking about that, if this is the right place to decode form data, but my backend knowledge is limited, I would need a little guidance here. Where is the load function called?

It's in the FieldsHelper::renderForm function.

I can't find renderForm function in administrator/com_fields/helpers/fields.php file. Did you mean function render()?

Here https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_fields/helpers/fields.php#L496

Ok, I hope I got it right, after making a change in helper file warning is gone. Change in JForm was reverted.

@esedic is PR ready for Retest?

Looks good for me

I have tested this item ? unsuccessfully on e7b203a

Not this value R&B does not work.

PHP Warning:  SimpleXMLElement::__construct(): Entity: line 2: parser error : EntityRef: expecting ';' in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

PHP Warning:  SimpleXMLElement::__construct(): hint="" required="false" readonly="false" validate="options"><option value="R&B in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

PHP Warning:  SimpleXMLElement::__construct(): ^ in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

PHP Warning:  SimpleXMLElement::__construct(): Entity: line 2: parser error : EntityRef: expecting ';' in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

PHP Warning:  SimpleXMLElement::__construct(): ="" required="false" readonly="false" validate="options"><option value="R&B">R&B in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

PHP Warning:  SimpleXMLElement::__construct(): ^ in \joomla-cms-staging\libraries\joomla\form\form.php on line 728

I think I have a solution. Change htmlentities to htmlspecialchars in the following 2 lines:

https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_fields/libraries/fieldslistplugin.php#L44-L45

No more errors with the values: A&B and Manuel Gómez Padilla.

I don't know if it requires , ENT_COMPAT, 'UTF-8' with htmlspecialchars or something else. If someone knows, please submit a pull request. Thanks.

Great find @Quy !
It seems that it works, I've checked it on field title, name, label and text/values for fields color, list and checkboxes.
Regarding , ENT_COMPAT, 'UTF-8' part: PHP 5.4 and PHP 5.5 will use UTF-8 as the default encoding. In PHP 5.6 default_charset configuration option is used as the default value. Official docs on php.net still recommends specifying charset if you are using PHP 5.5 or earlier, so probably we should include it.

I've updated PR, reverted previous commit to helper file and updated fieldslistplugin.php.

List of changed file is empty, probably a missing commit.

Yep, I've made a commit to wrong branch. Done.

I appreciate the info/pr. I am not at my computer to test, however, the pr looks good.

I have tested this item ✅ successfully on 99e4a64

Created radio, checkboxes, and list custom fields. No errors on backend and frontend in article edit mode.

I have tested this item ✅ successfully on 99e4a64

RTC after two successful tests.

Merge into 3.7.1?