drupal_html_id() should be applied to whole ID string

Problem/Motivation

The function drupal_html_id() adds an incremental counter to the end of the string, based on the numbers of elements existing on the page and it's keeping saved values in the $drupal_static.

Steps to reproduce

It makes a problem when we create our custom function THEME_preprocess_bootstrap_tabs() and want to replace $id to be the following:
$id = drupal_html_id($item['#title'])
and it's always adding an incremental suffix (--2) on the end of the string because it executes first the main function template_preprocess_bootstrap_fieldgroup_nav().

Proposed resolution

My suggestion is to apply the whole string through drupal_html_id() as this is the target HTML element ID.