[PATCH v6 2/3] comctl32/treeview: Add a function for sending notifications that also checks for invalid treeview.

[Jacob Czekalla]

From: Jacob Czekalla

Some functions will need to check if the treeview is still valid after sending a notification to prevent further processing.
---
 dlls/comctl32/treeview.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index 073f62c66a2..7a427836f2f 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -522,6 +522,18 @@ TREEVIEW_SendRealNotify(const TREEVIEW_INFO *infoPtr, UINT code, NMHDR *hdr)
     return SendMessageW(infoPtr->hwndNotify, WM_NOTIFY, hdr->idFrom, (LPARAM)hdr);
 }

+static INT
+TREEVIEW_SendSafeNotify(const TREEVIEW_INFO *infoPtr, UINT code)
+{
+    NMHDR hdr;
+    INT ret = TREEVIEW_SendRealNotify(infoPtr, code, &hdr);
+    if (ret != 0)
+        ret = 1;
+    if (!IsWindow(infoPtr->hwnd))
+        ret = -1;
+    return ret;
+}
+
 static BOOL
 TREEVIEW_SendSimpleNotify(const TREEVIEW_INFO *infoPtr, UINT code)
 {