"Ratio of tip and base radii of points" (src/toolbox.cpp)

What's "base radius" and "tip radius"?

Tip radius is the distance from the center to the farthest handle. Base radius is the same for closest handle. Can you suggest better terms?

Does "point" mean "corner" here?

Yes, although "of points" is just redundant, I removed it.

"You cannot group objects from different groups or layers." (src/selection-chemistry.cpp) "You cannot raise/lower objects from different groups or layers." (src/selection-chemistry.cpp) "You cannot combine objects from different groups or layers." (src/path-chemistry.cpp)

First of all, what do you mean by "layer"?

This is for the future. We will (hopefully) soon have layers support. In SVG, layers will be represented by <g> as are groups, hence the messages.

Taking a look at the sources it seems that what we really mean by these 3 strings is something like "objects with different parents". Probably these strings could be worded a bit better.

Yes, but "parents" are confusing for a user. It's developer terminology.

You can't raise a grouped item (without raising the rest of the group), but you can raise the whole group, right?

No. You can raise/lower a grouped object (or an object in a layer) within it's group/layer, not within document root (try it).

The "raise" string talks about "different groups", which does not apply to this case.

I think it's correct. When you select objects with different parents, it's ambiguous where to raise/lower it, hence the message.

If you select a grouped item with Ctrl, you can't group it together with an ungrouped item, but you can group the group itself with that ungrouped item (right?).

No. You cannot even select a group and an item within that group at the same time, there's a check for that. When you have a group selected and try to select an item within it, te group is deselected, and vice versa (try it).

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