If you only plan to have simple (text-only) tooltips on full items, you can use this function to have IconView handle these automatically for you.
column should be set to the column in this’s model containing the tooltip texts, or -1 to
disable this feature.
Note that the signal handler sets the text with set_markup, so &, <, etc have to be escaped in the text.
an integer, which is a valid column number for this’s model