Activity Stream panel:space-separated missing near RSS logo

Hello

To reproduce the problem: from http://localhost:8080/xwiki/bin/inline/Dashboard/WebHome?editor=inline edit "activity stream": in Edit gadget windows: set "true" in "RSS (Whether to show activity RSS link or not)" field and "Insert Gadget"
A space-separated missing between RSS logo and "RSS feed" with colibri and flamingo skin.
Here a screenshot for space-separated missing:

BTW, if I resize a little bit Main WebHome with FF (Zoom down), bottom of icons of "Activity stream" are cut (this problem doesn't appear on User Index page by example)
Here two screenshots for space-separated missing:

Thxs