Pull Request for several closed issues

Summary of Changes

When an option in a select list is disabled it is not visually displayed any differently to an enabled option. You just can't select/highlight it

Although we dont have any examples (that I am aware of) in the core of this there are many extensions that do. Usually when there are "pro" options that are disabled in a regular version.

This PR just adds a slight background to the disabled option

Testing Instructions

This is an scss change so you will need to either test with a prebuilt package or run npm run build:css

Then edit administrator\components\com_content\forms\article.xml and add the following line as an additional option for the Status Field
<option value="3" disabled="disabled">Disabled</option>

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• [ x Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed