vim-patch:9.0.2178: reg_executing() wrong for :normal with range (#26660)

Problem:  reg_executing() returns wrong result in :normal with range
          when 'showcmd' is set (after 8.2.4705).
Solution: Reset "pending_end_reg_executing" when executing a register.

closes: vim/vim#13707

615202bd0e

src/nvim/ops.c

@@ -1160,6 +1160,7 @@ int do_execreg(int regname, int colon, int addcr, int silent)
       }
     }
     reg_executing = regname == 0 ? '"' : regname;  // disable the 'q' command
+    pending_end_reg_executing = false;
   }
   return retval;
 }