credui: Show a balloon tip in the credential dialog if CREDUI_FLAGS_INCORRECT_PASSWORD was specified.

explorer: Add a fixme to show when applications are trying to show a balloon tip in the taskbar notification area.

This does not mean to use the current cursor position. Instead, it means
that the left hand edge of balloon tips doesn't have to be exactly the
co-ordinate passed in (i.e. the stem can be as vertical as possible) and
it means non-balloon tips can use smart placement.

comctl32: Unify the implementation of TOOLTIPS_Show and TOOLTIPS_TrackShow to give tracked tooltips balloon support.

Check that there is a connection before trying to cancel it.