comctl32: TTM_ADDTOOLW must refuse to set a tooltip text to NULL.

[Francois Gouget]

Note that TTM_ADDTOOLA accepts those because of the Unicode conversion.
---

As far as I can tell this patch also updates all the places that were 
relying on the old behavior.

 dlls/comctl32/status.c         |  2 ++
 dlls/comctl32/tests/tooltips.c |  2 +-
 dlls/comctl32/tooltips.c       | 47 +++++++++++++++++++++++-------------------
 dlls/comctl32/trackbar.c       |  2 ++
 4 files changed, 31 insertions(+), 22 deletions(-)

diff --git a/dlls/comctl32/status.c b/dlls/comctl32/status.c
index c4efedb..5d6fdf1 100644
--- a/dlls/comctl32/status.c
+++ b/dlls/comctl32/status.c
@@ -700,10 +700,12 @@ STATUSBAR_SetParts (STATUS_INFO *infoPtr, INT count, LPINT parts)
     if (infoPtr->hwndToolTip) {
 	INT nTipCount;
 	TTTOOLINFOW ti;
+	const WCHAR wEmpty[1] = {0};
 
 	ZeroMemory (&ti, sizeof(TTTOOLINFOW));
 	ti.cbSize = sizeof(TTTOOLINFOW);
 	ti.hwnd = infoPtr->Self;
+	ti.lpszText = (LPWSTR)wEmpty;
 
 	nTipCount = SendMessageW (infoPtr->hwndToolTip, TTM_GETTOOLCOUNT, 0, 0);
 	if (nTipCount < infoPtr->numParts) {
diff --git a/dlls/comctl32/tests/tooltips.c b/dlls/comctl32/tests/tooltips.c
index eefb4eb..3a54e65 100644
--- a/dlls/comctl32/tests/tooltips.c
+++ b/dlls/comctl32/tests/tooltips.c
@@ -420,7 +420,7 @@ static void test_gettext(void)
     toolinfoW.lParam = 0xdeadbeef;
     GetClientRect(hwnd, &toolinfoW.rect);
     r = SendMessageW(hwnd, TTM_ADDTOOLW, 0, (LPARAM)&toolinfoW);
-    todo_wine ok(!r, "Adding the tool to the tooltip failed\n");
+    ok(!r, "Adding the tool to the tooltip succeeded!\n");
 
     if (0)  /* crashes on NT4 */
     {
diff --git a/dlls/comctl32/tooltips.c b/dlls/comctl32/tooltips.c
index a325bcc..f74ea65 100644
--- a/dlls/comctl32/tooltips.c
+++ b/dlls/comctl32/tooltips.c
@@ -1037,6 +1037,9 @@ TOOLTIPS_AddToolT (TOOLTIPS_INFO *infoPtr, const TTTOOLINFOW *ti, BOOL isW)
 	   infoPtr->hwndSelf, ti->hwnd, ti->uId,
 	   (ti->uFlags & TTF_IDISHWND) ? " TTF_IDISHWND" : "");
 
+    if (ti->cbSize >= TTTOOLINFOW_V2_SIZE && !ti->lpszText && isW)
+        return FALSE;
+
     if (infoPtr->uNumTools == 0) {
 	infoPtr->tools = Alloc (sizeof(TTTOOL_INFO));
 	toolPtr = infoPtr->tools;
@@ -1060,27 +1063,29 @@ TOOLTIPS_AddToolT (TOOLTIPS_INFO *infoPtr, const TTTOOLINFOW *ti, BOOL isW)
     toolPtr->rect   = ti->rect;
     toolPtr->hinst  = ti->hinst;
 
-    if (IS_INTRESOURCE(ti->lpszText)) {
-	TRACE("add string id %x\n", LOWORD(ti->lpszText));
-	toolPtr->lpszText = ti->lpszText;
-    }
-    else if (ti->lpszText) {
-	if (TOOLTIPS_IsCallbackString(ti->lpszText, isW)) {
-	    TRACE("add CALLBACK!\n");
-	    toolPtr->lpszText = LPSTR_TEXTCALLBACKW;
-	}
-	else if (isW) {
-	    INT len = lstrlenW (ti->lpszText);
-	    TRACE("add text %s!\n", debugstr_w(ti->lpszText));
-	    toolPtr->lpszText =	Alloc ((len + 1)*sizeof(WCHAR));
-	    strcpyW (toolPtr->lpszText, ti->lpszText);
-	}
-	else {
-	    INT len = MultiByteToWideChar(CP_ACP, 0, (LPSTR)ti->lpszText, -1, NULL, 0);
-	    TRACE("add text \"%s\"!\n", (LPSTR)ti->lpszText);
-	    toolPtr->lpszText =	Alloc (len * sizeof(WCHAR));
-	    MultiByteToWideChar(CP_ACP, 0, (LPSTR)ti->lpszText, -1, toolPtr->lpszText, len);
-	}
+    if (ti->cbSize >= TTTOOLINFOW_V1_SIZE) {
+        if (IS_INTRESOURCE(ti->lpszText)) {
+            TRACE("add string id %x\n", LOWORD(ti->lpszText));
+            toolPtr->lpszText = ti->lpszText;
+        }
+        else if (ti->lpszText) {
+            if (TOOLTIPS_IsCallbackString(ti->lpszText, isW)) {
+                TRACE("add CALLBACK!\n");
+                toolPtr->lpszText = LPSTR_TEXTCALLBACKW;
+            }
+            else if (isW) {
+                INT len = lstrlenW (ti->lpszText);
+                TRACE("add text %s!\n", debugstr_w(ti->lpszText));
+                toolPtr->lpszText =	Alloc ((len + 1)*sizeof(WCHAR));
+                strcpyW (toolPtr->lpszText, ti->lpszText);
+            }
+            else {
+                INT len = MultiByteToWideChar(CP_ACP, 0, (LPSTR)ti->lpszText, -1, NULL, 0);
+                TRACE("add text \"%s\"!\n", (LPSTR)ti->lpszText);
+                toolPtr->lpszText =	Alloc (len * sizeof(WCHAR));
+                MultiByteToWideChar(CP_ACP, 0, (LPSTR)ti->lpszText, -1, toolPtr->lpszText, len);
+            }
+        }
     }
 
     if (ti->cbSize >= TTTOOLINFOW_V2_SIZE)
diff --git a/dlls/comctl32/trackbar.c b/dlls/comctl32/trackbar.c
index 9673771..054dacb 100644
--- a/dlls/comctl32/trackbar.c
+++ b/dlls/comctl32/trackbar.c
@@ -1526,10 +1526,12 @@ TRACKBAR_Create (HWND hwnd, const CREATESTRUCTW *lpcs)
 
     	if (infoPtr->hwndToolTip) {
             TTTOOLINFOW ti;	    
+            const WCHAR wEmpty[1] = {0};
             ZeroMemory (&ti, sizeof(ti));
             ti.cbSize   = sizeof(ti);
      	    ti.uFlags   = TTF_IDISHWND | TTF_TRACK | TTF_ABSOLUTE;
 	    ti.hwnd     = hwnd;
+            ti.lpszText = (LPWSTR)wEmpty;
 
             SendMessageW (infoPtr->hwndToolTip, TTM_ADDTOOLW, 0, (LPARAM)&ti);
 	 }
-- 
1.8.4.3