[PATCH v8 2/2] comctl32/treeview: Return from TREEVIEW_LButtonDown when the treeview handle is invalid.

[Jacob Czekalla]

From: Jacob Czekalla

LButtonDown should return when the treeview handle is invalid (e.g. destroyed) after NM_CLICK to prevent further message processing.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58211
---
 dlls/comctl32/tests/treeview.c |  2 +-
 dlls/comctl32/treeview.c       | 11 ++++++++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/dlls/comctl32/tests/treeview.c b/dlls/comctl32/tests/treeview.c
index 1b743a0a23c..d7591b568e9 100644
--- a/dlls/comctl32/tests/treeview.c
+++ b/dlls/comctl32/tests/treeview.c
@@ -3184,7 +3184,7 @@ static void test_treeview_delete_midclick(void)
     }

flush_events();
-    ok_sequence(sequences, TREEVIEW_SEQ_INDEX, test_click_delete_seq, "treeview click and destroy sequence", TRUE);
+    ok_sequence(sequences, TREEVIEW_SEQ_INDEX, test_click_delete_seq, "treeview click and destroy sequence", FALSE);

flush_sequences(sequences, NUM_MSG_SEQUENCES);
     SetCursorPos(orig_pos.x, orig_pos.y);
diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index 073f62c66a2..d9c84830414 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -526,7 +526,16 @@ static BOOL
 TREEVIEW_SendSimpleNotify(const TREEVIEW_INFO *infoPtr, UINT code)
 {
     NMHDR hdr;
-    return TREEVIEW_SendRealNotify(infoPtr, code, &hdr);
+    HWND hwnd;
+    BOOL result;
+
+    hwnd = infoPtr->hwnd;
+    result = TREEVIEW_SendRealNotify(infoPtr, code, &hdr);
+
+    if (!IsWindow(hwnd))
+        return TRUE;
+    else
+        return result;
 }

static VOID