It can happen that there is only one auto complete suggestion, which is already fully typed. In this case the popup should disappear.
The plugin should also be aware of any caret navigation in the middle of typing a word, especially caret movement as a result of mouse clicks. Partially typed words can and should not be autocompleted if the previously typed characters are no longer relevant to the current position of text insertion.
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The feature of disposing a fully-typed completion is already implemented in SVN (revision 10870), but is not yet released.