comctl32: Fix callback in treeview.

dlls/comctl32/tests/treeview.c

@@ -311,7 +311,7 @@ static void TestCallback(void)
     ok(ret == 1, "Expected SetItem return 1, got %ld\n", ret);
     tvi.pszText = buf;
     TreeView_GetItem(hTree, &tvi);
-    todo_wine ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
+    ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
         tvi.pszText, TEST_CALLBACK_TEXT);
 
     U(ins).item.pszText = NULL;
@@ -320,7 +320,7 @@ static void TestCallback(void)
     tvi.hItem = hItem2;
     memset(buf, 0, sizeof(buf));
     TreeView_GetItem(hTree, &tvi);
-    todo_wine ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
+    ok(strcmp(tvi.pszText, TEST_CALLBACK_TEXT) == 0, "Item text mismatch %s vs %s\n",
         tvi.pszText, TEST_CALLBACK_TEXT);
 }
 

dlls/comctl32/treeview.c

@@ -1112,7 +1112,7 @@ TREEVIEW_DoSetItemT(const TREEVIEW_INFO *infoPtr, TREEVIEW_ITEM *wineItem,
     if (tvItem->mask & TVIF_TEXT)
     {
         wineItem->textWidth = 0; /* force width recalculation */
-	if (tvItem->pszText != LPSTR_TEXTCALLBACKW) /* covers != TEXTCALLBACKA too */
+	if (tvItem->pszText != LPSTR_TEXTCALLBACKW && tvItem->pszText != NULL) /* covers != TEXTCALLBACKA too, and undocumented: pszText of NULL also means TEXTCALLBACK */
 	{
             int len;
             LPWSTR newText;