Paul Deitel reports --

Separately, if I type a multiline snippet and press Enter, then when I use the up arrow, it goes one line at a time back through that snippet. On the other hand if I re-execute a multiline snippet with /<id>, when I press the up arrow, it recalls the entire snippet. Then, as I continue to up arrow, the prompt gets corrupted.

Paul
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This problem can be reproduced with: /<id> /! and /-<n>

Example --

jshell> /li

   1 : class C {
         int m() { return 4; }
       }
                                                                                                                                                                        
jshell> /1
class C {
  int m() { return 4; }
}
| modified class C
                                                                                                                                                                        
jshell> class C {
  int m() { return 4; }
}