Add comments, fix negative value from GetCurFocus.

dlls/comctl32/tab.c

@@ -201,6 +201,8 @@ TAB_DumpItemInternal(TAB_INFO *infoPtr, UINT iItem)
     }
 }
 
+/* RETURNS
+ *   the index of the selected tab, or -1 if no tab is selected. */
 static LRESULT
 TAB_GetCurSel (HWND hwnd)
 {
@@ -209,11 +211,21 @@ TAB_GetCurSel (HWND hwnd)
     return infoPtr->iSelected;
 }
 
+/* RETURNS
+ *   the index of the tab item that has the focus
+ * NOTE
+ *   we have not to return negative value
+ * TODO
+ *   test for windows */
 static LRESULT
 TAB_GetCurFocus (HWND hwnd)
 {
     TAB_INFO *infoPtr = TAB_GetInfoPtr(hwnd);
-
+    if (infoPtr->uFocus<0)
+    {
+        FIXME("we have not to return negative value");
+        return 0;
+    }
     return infoPtr->uFocus;
 }
 
@@ -255,7 +267,7 @@ TAB_SetCurFocus (HWND hwnd,WPARAM wParam)
     FIXME("Should set input focus\n");
   } else {
     int oldFocus = infoPtr->uFocus;
-    if (infoPtr->iSelected != iItem || infoPtr->uFocus == -1 ) {
+    if (infoPtr->iSelected != iItem || oldFocus == -1 ) {
       infoPtr->uFocus = iItem;
       if (oldFocus != -1) {
         if (!TAB_SendSimpleNotify(hwnd, TCN_SELCHANGING))  {