[PATCH 4/6] wtsapi32: Allow deregistering windows in WTSUnRegisterSessionNotificationEx().

[Patrick Hibbs]

Ensure the heap doesn't run out of space, and return the proper status codes.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=47433
Signed-off-by: Patrick Hibbs 
---
v2: Fix status code based on tests, make mismatched message a trace.
---
 dlls/wtsapi32/wtsapi32.c | 29 ++++++++++++++++++++++++++---
 1 file changed, 26 insertions(+), 3 deletions(-)

diff --git a/dlls/wtsapi32/wtsapi32.c b/dlls/wtsapi32/wtsapi32.c
index dccd5ec1a1..8bc7348fca 100644
--- a/dlls/wtsapi32/wtsapi32.c
+++ b/dlls/wtsapi32/wtsapi32.c
@@ -451,12 +451,35 @@ BOOL WINAPI WTSUnRegisterSessionNotification(HWND hWnd)
 }

/************************************************************
- *                WTSUnRegisterSessionNotification (WTSAPI32.@)
+ *                WTSUnRegisterSessionNotificationEx (WTSAPI32.@)
  */
 BOOL WINAPI WTSUnRegisterSessionNotificationEx(HANDLE hServer, HWND hWnd)
 {
-    FIXME("Stub %p %p\n", hServer, hWnd);
-    return FALSE;
+    BOOL found = FALSE;
+    WTSAPI32InternalRegMNGTStr *mgntStr, *cursor2;
+    FIXME("Simi-Stub %p %p\n", hServer, hWnd);
+
+    /* Only deregister a window if it was registered previously.
+     */
+    LIST_FOR_EACH_ENTRY_SAFE(mgntStr, cursor2, &RegisteredWindowsToNotifiy,
+        WTSAPI32InternalRegMNGTStr, entry)
+    {
+        if ((mgntStr != NULL) && (mgntStr->hServer == hServer) && (mgntStr->hWnd == hWnd))
+        {
+            found = TRUE;
+            list_remove(&mgntStr->entry);
+            HeapFree(GetProcessHeap(), 0, mgntStr);
+        }
+    }
+
+    /* Log mismatched UnRegister calls.
+     */
+    if (!found)
+    {
+        TRACE("Mismatched WTSUnRegisterSessionNotification\n");
+    }
+
+    return TRUE;
 }