Insert Tag: separate two sections by a small space to minimise user error

The "Insert Tag" icon has two sections directly adjacent to each other. The one on the left allows you to create a new tag pair; the one on the right allows you to apply a tag pair to a selcted block of text.

IME, it is all too easy to accidentally select the wrong half of the icon due to the proximity of the two halves.

SUGGESTION: Separate the two halves by a small space and have a separate tool tip for each. This will prevent the user accidentally clicking on, say, "create a tag" when s/he really wants to "apply a tag".