Originally Posted by xiamenese
I didn't know that about 10.5.
I know no more than you do, I just suspect it is likely given the way Apple appears to be heading (i.e. from the current version of Mail, to the leaked screenshots of iCal, etc). It seems likely to me that drawers are to be deprecated as an UI paradigm in favour of panes and if they are, OmniGroup will be forced to use them in order to remain good UI citizens.
FWIW, here's one of the earlier threads about panes versus drawers - although it is in the context of OmniOutliner rather than OmniWeb, my points in favour of a drawer are just as valid for OmniWeb as they are for OmniOutliner:
I can add a 7th and 8th item to my list of positives of a drawer over a pane (as implemented by Apple):
7. When the contents of the drawer exceed the vertical height of the drawer, because a placeholder already exists for it, the appearance of the scrollbar does not affect the drawer contents. With a pane, the drawer contents have to shrink to accommodate the newly appeared scrollbar.
8. The visual distinction between the contents of the drawer and that of the window is much stronger due to the drop shadow at the edge of the content window onto the drawer. Apple's panes have very little to distinguish them visually (a faint black line and a barely distinguishable faint blue tone and that is it). This has the effect of making the contents of a drawer appear (correctly) as being something other than the contents of the window.
See SafariStand for how annoying 7. is, and how less distinctive 8. is.