Description of problem:
top doesn't show all threads if using pid option and turn on show threads interactively, where it works just fine if using the command line option to turn threads

Version-Release number of selected component (if applicable):

broken in fc11 3.2.7 and rawhide 3.2.28

How reproducible:

easy

Steps to Reproduce:
1. find a threaded app
pid=$( ps -e -o 'nlwp pid'  | sort -n |  awk '{ print $2 }'  | tail -1 )

2. run top with that pid with "show threads" from command line
  top -p $pid -H
3. run top with that pid with "show threads" turn on after it's started
   top -p
 (while running type "H")

Actual results:

the threads enter one by one, on refresh

Expected results:

all threads show up immediately