Bug 328077. Fix Windows drag-drop crash. patch by Yuri Kovalchuk. r+sr=roc

widget/src/windows/nsDragService.cpp

@@ -222,6 +222,12 @@ nsDragService::InvokeDragSession(nsIDOMNode *aDOMNode,
   if (NS_FAILED(rv))
     return rv;
 
+  // set the directory promise flavour
+  // if this fails it won't affect the drag so we can just continue
+  trans->SetTransferData(kFilePromiseDirectoryMime,
+                         dropLocalFile,
+                         sizeof(nsILocalFile*));
+
   // Create a new FileURI to pass to the nsIDownload
   nsCOMPtr<nsIURI> targetURI;
 

widget/src/windows/nsDragService.h

@@ -63,14 +63,14 @@ typedef struct {
 #endif // SHCNE_RENAMEITEM_DEF
 
 // Register for shell notifications func ptr
-typedef ULONG (*SHCNRegPtr)(HWND hWnd,                      // Ordinal of 2
+typedef WINSHELLAPI ULONG (WINAPI *SHCNRegPtr)(HWND hWnd,                      // Ordinal of 2
                                                int fSources,
                                                LONG fEvents,
                                                UINT wMsg,
                                                int cEntries,
                                                SHChangeNotifyStruct *pschn);
 // Unregister form from the shell notifications func ptr
-typedef BOOL (*SHCNDeregPtr)(ULONG ulID);                   // Ordinal of 4
+typedef WINSHELLAPI BOOL (WINAPI *SHCNDeregPtr)(ULONG ulID);                   // Ordinal of 4
 
 /**
  * Native Win32 DragService wrapper