Tooltip not updated for overflowed tab

should add
`if ([[self delegate] respondsToSelector:@selector(tabView:toolTipForTabViewItem:)]) {
        NSString *toolTip = [[self delegate] tabView:[self tabView] toolTipForTabViewItem:item];
        [lastButton setToolTip:toolTip];
    }`
in `- (void)setTabViewItemPinnedToOverflowButton:(NSTabViewItem *)item` ?