Description of problem:

Bugzilla does not detect mid-air collisions when the person making the second
modification began looking at the bug before any modification had been made to
the bug.

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


How reproducible:



Steps to Reproduce:
1. create a new bug.
2. bring up two copies of it in two different browser windows
3. submit a change to one of these.
4. submit another change to the second one.
  
Actual results:

The title says a mid-air collision occurred, but the rest of the page looks like
a normal bug change response and the changes are made.

Expected results:

a complete mid-air report page should be shown and no changes made.

Additional info: