Description

Steps to reproduce:

1. Navigate to https://wikifunctions.beta.wmflabs.org/wiki/Special:CreateZObject?zid=Z14&Z14K1=Z801 to create a new Implementation for Z801/Echo
2. Select 'Code' for Implementation type and 'JavaScript' for Language
3. [Observe contents of Code block]
4. Change function to Z802/If
5. [Observe contents of Code block]
6. Switch Implementation type to 'Composition' and back to 'Code'
7. [Observe contents of Code block]

Observed behavior:

• Initial code block is pre-filled with function Z801( ) { … } – doesn't add the input (Z801K1)
• Code block isn't updated when target function is changed – still for Z801
• Re-created code block is correct after switching back from Composition to Code: function Z802( Z802K1, Z802K2, Z802K3 ) { … }

Expected behaviour (Acceptance criteria):

• Initial code block should be function Z801( Z801K1 ) { … }
• On changing function, the code block should be updated to function Z802( Z802K1, Z802K2, Z802K3 ) { … }
• Switch Implementation type to 'Composition' and back to 'Code' should not create a difference.

Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Front-end_Task/Bug_Completion_Checklist