vim-patch:8.2.0929: v:register is not cleared after an operator was executed

Problem:    v:register is not cleared after an operator was executed.
Solution:   Clear v:register after finishing an operator (Andy Massimino,
            closes vim/vim#5305)
cc613031b9

src/nvim/normal.c

@@ -903,6 +903,10 @@ normal_end:
 
   msg_nowait = false;
 
+  if (finish_op) {
+    set_reg_var(get_default_register_name());
+  }
+
   // Reset finish_op, in case it was set
   s->c = finish_op;
   finish_op = false;