Fix possible deadlock in wxEvtHandler::ProcessPendingEvents().

Delete the event we just processed before re-locking the critical section as
this may result in deadlocks if the (user-defined) event dtor does something
non-trivial.

Closes #10790.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@61982 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/event.cpp

@@ -1181,6 +1181,7 @@ void wxEvtHandler::ProcessPendingEvents()
     for ( wxList::compatibility_iterator node = m_pendingEvents->GetFirst();
           node;
           node = m_pendingEvents->GetFirst() )
+    {
         {
             wxEventPtr event(wx_static_cast(wxEvent *, node->GetData()));
 
@@ -1193,6 +1194,9 @@ void wxEvtHandler::ProcessPendingEvents()
             wxLEAVE_CRIT_SECT( Lock() );
 
             ProcessEvent(*event);
+        } // delete the event at this block exit, before re-locking our
+          // critical section, to avoid deadlocks if the event dtor locks
+          // something else itself (see #10790)
 
         wxENTER_CRIT_SECT( Lock() );