Use correct message filters in MsgWaitForMultipleObjects

Omission from commit 648f24f5, that
made TWAIN GUI to lag.

Change-Id: If2bbc53c2abf11e724f0cd6ad470a0263cd8457d
Reviewed-on: https://gerrit.libreoffice.org/65713
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

extensions/source/scanner/scanwin.cxx

@@ -251,8 +251,7 @@ void Twain::ShimListenerThread::execute()
         HANDLE h = hShimProcess.get();
         while (true)
         {
-            DWORD nWaitResult = MsgWaitForMultipleObjects(1, &h, FALSE, INFINITE,
-                                                          QS_ALLPOSTMESSAGE | QS_SENDMESSAGE);
+            DWORD nWaitResult = MsgWaitForMultipleObjects(1, &h, FALSE, INFINITE, QS_POSTMESSAGE);
             // Process any messages in queue before checking if we need to break, to not loose
             // possible pending notifications
             while (PeekMessageW(&msg, nullptr, 0, 0, PM_REMOVE))

extensions/source/scanner/twain32shim.cxx

@@ -561,8 +561,8 @@ int WINAPI wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int)
         MSG msg;
         while (true)
         {
-            DWORD nWaitResult = MsgWaitForMultipleObjects(1, &hParentThread, FALSE, INFINITE,
-                                                          QS_ALLPOSTMESSAGE | QS_SENDMESSAGE);
+            DWORD nWaitResult
+                = MsgWaitForMultipleObjects(1, &hParentThread, FALSE, INFINITE, QS_ALLINPUT);
             if (nWaitResult == WAIT_OBJECT_0)
                 return 5; // Parent process' thread died before we exited
             if (nWaitResult == WAIT_FAILED)