I need to group a bunch of pageItems before I throw them to .rasterize(). Made me think. Are there any known scenarios where grouping could change the appearance that I need to take into account?
Grouping objects will collect them into a group in the stacking order as can be seen in the expanded Layer in the Layers panel.
This means that the objects in the group will be consecutive from the topmost to the bottommost of the group itself.
If there were other objects in between the grouped ones, all objects in the group will be above them in the stacking order.
Obviously, such a change in stacking order can change the appearance so that objects in the group (partly) covered by others will now cover them instead.
Absolutely. I was thinking more like if any effects, blending modes, and stuff like that are known to change appearance if being grouped.
No, they are just collected but keep their individual properties.
You are welcome, iLLMonkey.
I'll just add a further comment: you have nothing to worry about if you are adding the items to a new group. If you are adding items to an existing group then you must consider the effects of that group's appearance. Probably not an issue in your case.
Mark is certainly right, of course.
The exact way of placing a new item can be crucial, far beyond a simple change in covering, such as the new item partly or completely vanishing if placed within a clipping set.