Fix bug related to assignees dropdown showing old values

[yucongkoo]

Summary:

Fixes #1348

Changes Made:

• Fixed the bug as mentioned in the issue by updating the value of assignees accordingly when the issue changed

Proposed Commit Message:

Fix bug related to assignees dropdown showing old values

[yucongkoo]

The key problem here is that the value shown in the dropdown of assignees is the variable this.assignees, and this value is not updated when the this.issue is updated (which is the case when we mark and unmark an issue as duplicate).

[yucongkoo]

Video of the fixed behaviour:
https://github.com/user-attachments/assets/3ed55e2d-20cf-4efc-b695-08b03b88955f

[damithc]

@yucongkoo What's the current behaviour? Is it as follows?

Suppose issue A is assigned to Adam, and issue B is assigned to Betsy.

Issue A (Adam)
Issue B (Betsy)

Issue B is marked as a duplicate of A -> Issue B's previous assignees (i.e., Betsy) are removed. It inherits A's assignees (i.e., Adam).

Issue A (Adam)
Issue B (Adam)

Issue B is now un-marked as duplicate of A -> EDIT: Issue B's current assignees are removed. It no longer has any assignees. Issue B will keep assignees it inherited from issue A.

Issue A (Adam)
Issue B (Adam)

[yucongkoo]

@damithc
When you unmark issue B as a duplicate of Issue A, the assignees of issue B will be kept as the assignees of Issue A, so Adam in the provided scenario.

Same applies to the labels.

[damithc]

@damithc When you unmark issue B as a duplicate of Issue A, the assignees of issue B will be kept as the assignees of Issue A, so Adam in the provided scenario.

Same applies to the labels.

Got it. Yeah, that makes sense. I updated my comment to reflect this.

[yucongkoo]

@damithc
Yup the updated scenario is the current behaviour.

The fix included in this PR is for the behaviour when we click on the edit assignees icon.

Behaviour before the fix:
After Issue B is unmarked as a duplicate, it is still assigned to Adam.
If we click edit assignees, the dropdown will show Betsy (the original assignee to Issue B) is selected.

Behaviour after the fix:
After Issue B is unmarked as a duplicate, it is still assigned to Adam.
If we click edit assignees, the dropdown will show Adam is selected.

[Arif-Khalid]

Great change and great PR, working as intended.
Effort is clear in investigation and effective, concise resolution of the issue.
Just a minor change required to align with Angular standards.

[Arif-Khalid]

As warned by the github actions, please inherit from the OnChanges interface

[Arif-Khalid]

LGTM! 🤓