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We've reported this Froala and are trying to sort out a workaround. (I've identified changes that resolve it, but they may still cause other issues.) Right now, we're leaving this with them, but if needed we'll integrate a workaround manually.
Note that this also applies to the smilies list area.
As Mike says, we reported this to them previously, by email, with a suggested fix. Thought I’d jog their memory. It has now been fixed for the next Froala release (this may or may not be in the next XF release but we’re fairly quick at applying Froala updates).