IndexOutOfBoundsException when navigating completions options

[tpoliaw]

If multiple completion candidates are available (and MENU_COMPLETE is set), using the left/right keys move through the options. Moving left from the bottom-left options can through an exception if the number of candidates is not a multiple of the number of rows.

eg

Alpha  Bravo    Charlie  Delta
Echo   Foxtrot  Golf
Hotel  India    Juliet

Moving left from Hotel will try to select the option under Delta and fail.