In the string:
Alice bought Charlie deep emerald fish
… where "deep emerald" is a link, if the cursor is inside the link:
Alice bought Charlie d|eep emerald fish
… and you press the link button, the whole link ("deep emerald") is selected; however, if the cursor is just up-page of the link:
Alice bought Charlie |deep emerald fish
… then only the first word ("deep") is selected, causing nasty breakages and no-wiki'ing galore. Happens in standalone too.