on osx, popups can be positioned so that part of them are below the dock. this makes them impossible to access. the solution is to use ::GetAvailableWindowPositioningBounds() from CarbonLib 1.3 in nsScreenMac instead of simply checking the GDHandle. Luckily, the bounds we get back are a rect since gecko can't handle regions in any of the window positioning code.

This is also a problem for tooltips for the status bar buttons. Should that be a separate bug or can it be thrown in with this?

This is one of those particularly annoying interface bugs.

nominating for branch, this should be an easy kill after looking at the code.

patch attached that uses ::GetAvailableWindowPositioningBounds() to sub out the dock and the menubar. removes our code that does this for carbon builds only. needing r/sr. this is a safe patch, and big bang for the buck.

r=sdagley

Comment on attachment 50567 [details] [diff] [review] same patch, more lines of context sr=sfraser

per PDT email thread, mark PDT+. Does this also affect OS besides OS X?

landed on branch, waiting for trunk to open.

on trunk now

verified fixed 9.4 branch for xul popups, including tooltips, not extending below/behind the dock