DrawTile is not so effective on BeOS currently (IMHO this is at all not best idea to render background in OffscreenImage->ToScreen way), and if it is called permanently triggered by all repaint events, it is absolutely catastrofic for such sites as www.nbc.com. Second good illustration - if to drag some object over big scrollbar knob - Mozilla still causes scrollbar background pattern re-rendering, inspite dragging occurs over invisible (obscured by knob) background area. Though, in general, repaint area (and so Tile to repaint) are detected correctly.

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Boris, currently i'm unsure that this bug should be assigned to BeOS port mantainer. Until someone helps me to understand mechniscs of this visibility check. As far as i understand, layout engine handles information about z-order, parent-child relations and regions itself, outside port-code (widget or gfx)

Sergei, as you have a better understanding of the gfx code for BeOS, I am going to change the assignment of this bug to you. If that's a problem, set it back to me.

This one is fixed isn't it?

No, it didn't. I think it is rather meta-bug. Partly related to generic gecko-problems: http://wiki.mozilla.org/index.php/Gecko:Invalidation_Handling http://wiki.mozilla.org/index.php/Gecko:Frame_Painting

We don't support BeOS any more.

In the graveyard, code referred to doesn't exist to be fixed.