[fix small unintuitive thing] Smiley list should only appear if there is a space between a word and :

So, for example, I don't want the smiley menu to appear now: But I do want it to appear now :

If you give this a thought, I think you'll agree that this is right, more of the time than the current way it works.

Simply trigger the smiley menu if there is a space preceeding the colon.

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