[PATCH v4 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       | 8 ++++++--
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/dlls/comctl32/tests/treeview.c b/dlls/comctl32/tests/treeview.c
index faab6a6c623..4dfec5b5f00 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..3e8d91c524d 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -4315,8 +4315,10 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
         (ht.flags & TVHT_ONITEMLABEL) && (infoPtr->selectedItem == ht.hItem);

/* Send NM_CLICK right away */
-    if (!do_track && TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK))
+    if (!do_track && TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK) && IsWindow(hwnd))
         goto setfocus;
+    if (!IsWindow(hwnd))
+        return 0;

if (ht.flags & TVHT_ONITEMBUTTON)
     {
@@ -4345,8 +4347,10 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
         }
     }

-    if (do_track && TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK))
+    if (do_track && TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK) && IsWindow(hwnd))
         goto setfocus;
+    if (!IsWindow(hwnd))
+        return 0;

if (TREEVIEW_IsFullRowSelect(infoPtr))
         do_select = ht.flags & (TVHT_ONITEMINDENT | TVHT_ONITEMICON | TVHT_ONITEMLABEL | TVHT_ONITEMRIGHT);