let wxFileName::GetModificationTime() work with files already opened [maybe in another application]

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26994 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -123,6 +123,7 @@ wxMSW:
   even try to do it by default -- now it does
 - wxTaskBarIcon must be explicitly destroyed now, otherwise the application
   won't exit even though there are no top level windows
+- wxFileName::GetModificationTime() works with opened files too now
 
 wxMotif:
 

src/common/filename.cpp

@@ -163,7 +163,8 @@ public:
                      filename,                      // name
                      mode == Read ? GENERIC_READ    // access mask
                                   : GENERIC_WRITE,
-                     0,                             // no sharing
+                     FILE_SHARE_READ |              // sharing mode
+                     FILE_SHARE_WRITE,              // (allow everything)
                      NULL,                          // no secutity attr
                      OPEN_EXISTING,                 // creation disposition
                      0,                             // no flags