Need help with surfaces

A while back I wrote and releases the dynamic grid object. Recently a bug has been reported where simultaneously shrinking and moving the object causes the original area of the surface, minus the new area, to be pasted into the background. In all other cases (e.g. when the object doesn't move in the same event loop as it is being resized), this pasting bug doesn't occur.

I don't have enough experience with surfaces to know what's going on, so if one of you surface-oriented extension devs would like to offer some tips, I'd much appreciate it.

Usually this kind of problem occurs when you display your object at coordinates that are taken into account only in the next loop.

In your DisplayRunObject function, do you display your surface at (hoX,hoY)? If so, try displaying it at (hoRect.left,hoRect.top).

And if you change the coordinates or the size yourself in HandleRunObject, make sure you set rdPtr->roc.rcChanged to 1 so that the coordinates are validated.

Thanks. I'm actually using GetRunObjectSurface instead so I don't manage the coordinates directly, but I was setting the ho size in the action instead of handleRunObject. Moving it there fixed the bug.