Moving tag with dots in it loses first part of tag's name

[poelstra]

To reproduce, create tags such as this:

My tag A.B
Other tag

Now, drag My tag A.B onto Other tag, to make it a child.

This yields:

Other Tag
    B

I.e. the tag does get indented below Other Tag, but its name is changed to just "B". Strangely enough, any notes are still attached to it, and do display the original tag name (My tag A.B).