| g1row1 | 
  | g1row2 | 
  | g1row3 | 
  | g2row1 | 
  | g2row2 | 
  | g2row3 | 
  | g2row4 | 
Clicking the button above five times or more gives:
###!!! ASSERTION: invalid BC damage area: 'PR_FALSE', file nsTableFrame.cpp, line 4567
  | g1row1 | 
  | g1row2 | 
  | g1row3 | 
  | g2row1 | 
  | g2row2 | 
  | g2row3 | 
  | g2row4 | 
Clicking the button gives:
###!!! ASSERTION: invalid BC damage area: 'PR_FALSE', file nsTableFrame.cpp, line 4567
  | g1row1 | 
  | g1row2 | 
  | g1row3 | 
  | g2row1 | 
  | g2row2 | 
  | g2row3 | 
  |
Clicking the button the first time gives:
###!!! ASSERTION: invalid BC damage area: 'PR_FALSE', file nsTableFrame.cpp, line 4567