Steps to reproduce the issue

1. Add a subform field (repeatable) in any form and set the value of "min" attribute of subform field as 1
2. Name one of the input field in the subform as (repetable_subform-test). i.e use hyphen in the name of the input field.
3. For the first i.e the default block of repeatable subform the id of the input field with a hyphen in the name will be generated as "jform_com_tjucm_sample_subform__com_tjucm_sample_subform0__repetable_subform_test" as Joomla replaces all the non-word characters with (_) underscore for the attribute Id of all the fields (as per getId function in FormField class)
4. After clicking on the plus (+) button to add the repeatable block the id of the field with a hyphen in the name the id is generated as "jform_com_tjucm_sample_subform__com_tjucm_sample_subform1__repetable_subform-test" i.e the id contains hyphen as the hyphen is not replaced with an underscore in the code of subform-repetable.js file

Expected result

The id of the field in subform was expected to be without any hyphen in it "jform_com_tjucm_sample_subform__com_tjucm_sample_subform1__repetable_subform_test"

Actual result

The id of the input element contains hyphen if the field name contains a hyphen
"jform_com_tjucm_sample_subform__com_tjucm_sample_subform1__repetable_subform-test"

System information (as much as possible)

Latest Joomla

Additional comments

getId() function in class FormField has the code which replaces all the non-word characters in the id of an element to underscore.

Such code is missing in the "subform-repeatable.js" which generated the clone of the fields in the subform