ON_NOTIFY(HDN_ITEMCLICK, 0, ...) matches the inner header control's ID,
which is 0 for both m_CList_Online and m_CList_Message. So clicks on
either list's header reach OnHdnItemclickList, which always sorts the
host list by the clicked column index.
The cross-talk has existed since the initial migration commit (5a325a2).
It went unnoticed because pre-0aa7588 both lists' headers triggered the
handler in A mode and the columns happened to align (host list cols 0..2
== IP/Addr/Location, log list also has 3 cols), so log-header clicks
appeared to "sort plausibly". After 0aa7588 only the log list's A-mode
header reached the handler, surfacing the strange "click log header
re-sorts hosts" behavior.
Guard the handler by checking pNMHDR->hwndFrom against the online list's
header HWND. Log header clicks now have no effect on the host list.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
70a6b0128e