Testcase for bug 284852

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