[PATCH v13 1/2] 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/treeview.c | 51 ++++++++++++++++++++++++++++++----------
 1 file changed, 39 insertions(+), 12 deletions(-)

diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index bf9bad4715e..e353fda34af 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -522,11 +522,22 @@ TREEVIEW_SendRealNotify(const TREEVIEW_INFO *infoPtr, UINT code, NMHDR *hdr)
     return SendMessageW(infoPtr->hwndNotify, WM_NOTIFY, hdr->idFrom, (LPARAM)hdr);
 }

+/*
+ * Returns TRUE if the TREEVIEW is still valid after the notify.
+ * The notification result is stored in *result if non-NULL.
+ */
 static BOOL
-TREEVIEW_SendSimpleNotify(const TREEVIEW_INFO *infoPtr, UINT code)
+TREEVIEW_SendSimpleNotify(const TREEVIEW_INFO *infoPtr, UINT code, BOOL *result)
 {
     NMHDR hdr;
-    return TREEVIEW_SendRealNotify(infoPtr, code, &hdr);
+    HWND hwnd;
+    BOOL notify_val;
+
+    hwnd = infoPtr->hwnd;
+    notify_val = TREEVIEW_SendRealNotify(infoPtr, code, &hdr);
+    if (result)
+        *result = notify_val;
+    return IsWindow(hwnd);
 }

static VOID
@@ -4193,6 +4204,7 @@ TREEVIEW_LButtonDoubleClick(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 {
     TREEVIEW_ITEM *item;
     TVHITTESTINFO hit;
+    BOOL notify_result;

TRACE("\n");
     SetFocus(infoPtr->hwnd);
@@ -4211,7 +4223,9 @@ TREEVIEW_LButtonDoubleClick(TREEVIEW_INFO *infoPtr, LPARAM lParam)
    return 0;
     TRACE("item %d\n", TREEVIEW_GetItemIndex(infoPtr, item));

-    if (TREEVIEW_SendSimpleNotify(infoPtr, NM_DBLCLK) == FALSE)
+    if (TREEVIEW_SendSimpleNotify(infoPtr, NM_DBLCLK, &notify_result) == FALSE)
+        return 0;
+    if (notify_result == FALSE)
     {				/* FIXME! */
    switch (hit.flags)
    {
@@ -4258,7 +4272,7 @@ TREEVIEW_LButtonDoubleClick(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 static LRESULT
 TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 {
-    BOOL do_track, do_select, bDoLabelEdit;
+    BOOL do_track, do_select, bDoLabelEdit, notify_result;
     HWND hwnd = infoPtr->hwnd;
     TVHITTESTINFO ht;

@@ -4315,8 +4329,13 @@ 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))
-        goto setfocus;
+    if (!do_track)
+    {
+        if (!TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK, &notify_result))
+            return 0;
+        if (notify_result)
+            goto setfocus;
+    }

if (ht.flags & TVHT_ONITEMBUTTON)
     {
@@ -4345,8 +4364,13 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
         }
     }

-    if (do_track && TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK))
-        goto setfocus;
+    if (do_track)
+    {
+        if (!TREEVIEW_SendSimpleNotify(infoPtr, NM_CLICK, &notify_result))
+            return 0;
+        if (notify_result)
+            goto setfocus;
+    }

if (TREEVIEW_IsFullRowSelect(infoPtr))
         do_select = ht.flags & (TVHT_ONITEMINDENT | TVHT_ONITEMICON | TVHT_ONITEMLABEL | TVHT_ONITEMRIGHT);
@@ -4385,6 +4409,7 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 static LRESULT
 TREEVIEW_RButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 {
+    BOOL notify_result;
     TVHITTESTINFO ht;

if (infoPtr->hwndEdit)
@@ -4414,7 +4439,9 @@ TREEVIEW_RButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
     else
     {
    SetFocus(infoPtr->hwnd);
-	if(!TREEVIEW_SendSimpleNotify(infoPtr, NM_RCLICK))
+        if (!TREEVIEW_SendSimpleNotify(infoPtr, NM_RCLICK, &notify_result))
+            return 0;
+        if (!notify_result)
    {
        /* Send a WM_CONTEXTMENU message in response to the RBUTTONUP */
        SendMessageW(infoPtr->hwndNotify, WM_CONTEXTMENU,
@@ -5340,7 +5367,7 @@ TREEVIEW_KeyDown(TREEVIEW_INFO *infoPtr, WPARAM wParam)
    break;

case VK_RETURN:
-        TREEVIEW_SendSimpleNotify(infoPtr, NM_RETURN);
+        TREEVIEW_SendSimpleNotify(infoPtr, NM_RETURN, NULL);
         break;

case VK_HOME:
@@ -5666,7 +5693,7 @@ TREEVIEW_SetFocus(TREEVIEW_INFO *infoPtr)
     }

TREEVIEW_Invalidate(infoPtr, infoPtr->selectedItem);
-    TREEVIEW_SendSimpleNotify(infoPtr, NM_SETFOCUS);
+    TREEVIEW_SendSimpleNotify(infoPtr, NM_SETFOCUS, NULL);
     return 0;
 }

@@ -5677,7 +5704,7 @@ TREEVIEW_KillFocus(const TREEVIEW_INFO *infoPtr)

TREEVIEW_Invalidate(infoPtr, infoPtr->selectedItem);
     UpdateWindow(infoPtr->hwnd);
-    TREEVIEW_SendSimpleNotify(infoPtr, NM_KILLFOCUS);
+    TREEVIEW_SendSimpleNotify(infoPtr, NM_KILLFOCUS, NULL);
     return 0;
 }