Inconsistent Auto-Completion for className in JSX when Tag Closure is on the Same Line

[NuclEnergy]

Description

I am experiencing an issue with GitHub Copilot's auto-completion functionality within JSX files, specifically in className attributes of React components. Auto-completion does not trigger correctly when the JSX tag closure (>) is on the same line. However, if the tag is not closed on the same line where the className attribute is defined, Copilot functions as expected.

Steps to Reproduce

1. Type the following JSX code:

   <div className="# cursor here, auto-completion does not work properly">
     123
   </div>

2. Attempt to use auto-completion within the className attribute.

3. Notice that the suggestions either do not appear or are not relevant.

4. Now, modify the code to the following:

   <div className="# cursor still here, auto-completion works because there's no '>' on the same line "
     123
   </div>

5. Attempt to use auto-completion again and observe that it now triggers correctly.

6. Expected Behavior
   Auto-completion should consistently recognize and suggest relevant classes within the className attribute, irrespective of the presence or placement of the tag's closure (>).

Actual Behavior

When the JSX tag is closed on the same line as the className attribute, auto-completion either fails to trigger or provides irrelevant suggestions. This issue does not occur when the tag is not closed on the same line.

Possible Solution

Enhancing the parsing logic of GitHub Copilot for JSX to better handle scenarios where the tag closure is on the same line as the attribute could potentially resolve this inconsistency.

Additional Information

Copilot Version: v1.180.0
Editor Used: VSCode v1.88.1
Operating System: Windows 11 Enterprise (23H2)

This issue significantly impacts the coding experience, especially for developers working extensively with React and JSX. An improvement in this area would greatly enhance productivity and user experience. Thank you for your attention to this matter.