Modal dialog not show on top of page in Firefox, Chrome when dialog higher than screen high

[mashizilla]

it occur only when scroll down ($(document).scrollTop() > 0) and dialog higher than screen high. I have test print out dialog top position and $(document).scrollTop in Firefox its not equal (In IE dialog top position equal to $(document).scrollTop and show dialog on top of page correctly)

[rdworth]

Please link to a minimal test case that demonstrates the issue

[trac-o-bot]

Because we get so many tickets, we often need to return them to the initial reporter for more information. If that person does not reply within 14 days, the ticket will automatically be closed, and that has happened in this case. If you still are interested in pursuing this issue, feel free to add a comment with the requested information and we will be happy to reopen the ticket if it is still valid. Thanks!