The i18n commit (0aa7588) enabled LVM_SETUNICODEFORMAT(TRUE) on the online
list. That flag also flips the embedded header control to Unicode mode, so
header notifications switch from HDN_ITEMCLICKA (= HDN_ITEMCLICK in MBCS
build) to HDN_ITEMCLICKW. The existing ON_NOTIFY mapping only handles the
A version, so clicking the column header silently does nothing.
Add a parallel ON_NOTIFY for HDN_ITEMCLICKW dispatching to the same handler.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
b252cbbaf2