Gtk.TextIter.prototype.set_visible_line_offset

function set_visible_line_offset(char_on_line:Number):void {
    // Gjs wrapper for gtk_text_iter_set_visible_line_offset()
}

Like Gtk.TextIter.prototype.set_line_offset, but the offset is in visible characters, i.e. text with a tag making it invisible is not counted in the offset.

char_on_line: a character offset