Resolve "Projects::MergeRequestsController#show is slow (implement skeleton loading)"
What does this MR do?
on-demand clientside loading of MR Dicussion diffs
Are there points in the code the reviewer needs to double check?
- other usages of _diff_with_notes template (potentially any usage of discussions/discussion.html)
- probably a better place for this to live than toggle_behavior.js
Why was this MR needed?
Controller#show was slow
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
- 
Changelog entry added, if necessary 
- 
Documentation created/updated 
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API support added 
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Tests added for this feature/bug 
- Review
- 
Has been reviewed by UX 
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Has been reviewed by Frontend 
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Has been reviewed by Backend 
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Has been reviewed by Database 
 
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Conform by the merge request performance guides 
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Conform by the style guides 
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Squashed related commits together 
What are the relevant issue numbers?
Closes #35475 (closed)
Edited  by Simon Knox