[UI] Hovering on edge of items shows runes popup

For the first ~pixel? of mousing over an item with runes all rune popups appear. It doesn't appear to be a border since slowly mousing over the border from when the mouse is currently over the item doesn't show them. Seems to occur in any inventory space, not just the quad below. Not really that big a deal, just kinda annoying as it causes the main description box to popup in one spot for a frame or two then move to the spot it is supposed to be in.