[CS2] Fix object spread nested properties #4611
                
     Merged
            
            
          
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@GeoffreyBooth I noticed an error with the object spread nested properties in branch
2, e.g.obj2 = {obj.a.b.c..., obj["a"]["b"]...}This has been already fixed in #4493, but it seems that something went off in the latest commits.
This small PR restores the functionality back.
@connec do you mind taking a look since your commits also include changes in the
grammar?