right clicking outside any column sets the column in the list event to -1, not the last column

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14554 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/listevt.tex

@@ -37,7 +37,7 @@ functions that take a wxListEvent argument.
 \twocolitem{{\bf EVT\_LIST\_KEY\_DOWN(id, func)}}{A key has been pressed.}
 \twocolitem{{\bf EVT\_LIST\_INSERT\_ITEM(id, func)}}{An item has been inserted.}
 \twocolitem{{\bf EVT\_LIST\_COL\_CLICK(id, func)}}{A column ({\bf m\_col}) has been left-clicked.}
-\twocolitem{{\bf EVT\_LIST\_COL\_RIGHT\_CLICK(id, func)}}{A column ({\bf m\_col}) has been right-clicked.}
+\twocolitem{{\bf EVT\_LIST\_COL\_RIGHT\_CLICK(id, func)}}{A column ({\bf m\_col}) (which can be $-1$ if the click occured outside any column) has been right-clicked.}
 \twocolitem{{\bf EVT\_LIST\_COL\_BEGIN\_DRAG(id, func)}}{The user started resizing a column - can be vetoed.}
 \twocolitem{{\bf EVT\_LIST\_COL\_DRAGGING(id, func)}}{The divider between columns is being dragged.}
 \twocolitem{{\bf EVT\_LIST\_COL\_END\_DRAG(id, func)}}{A column has been resized by the user.}