don't wait for Windows messages in WaitForThread() if we don't dispatch events (should fix the bugs 1523302 and 1650795)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44345 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/app.cpp

@@ -227,6 +227,13 @@ bool wxGUIAppTraits::DoMessageFromThreadWait()
 
 DWORD wxGUIAppTraits::WaitForThread(WXHANDLE hThread)
 {
+    // if we don't have a running event loop, we shouldn't wait for the
+    // messages as we never remove them from the message queue and so we enter
+    // an infinite loop as MsgWaitForMultipleObjects() keeps returning
+    // WAIT_OBJECT_0 + 1
+    if ( !wxEventLoop::GetActive() )
+        return DoSimpleWaitForThread(hThread);
+
     return ::MsgWaitForMultipleObjects
              (
                1,                   // number of objects to wait for