Add a flag that ensure that a connection is made only one

It is often desirable, when doing connection, to ensure that the same
connection is only made once. This can be done with the
Qt::UniqueConnection 'flag'

Also documented the order the slot are called

Reviewed-by: Brad

1 files changed, 2 insertions, 1 deletions

diff --git a/src/corelib/global/qnamespace.h b/src/corelib/global/qnamespace.h
index 3367581..9e53d89 100644
--- a/src/corelib/global/qnamespace.h
+++ b/src/corelib/global/qnamespace.h
@@ -1327,7 +1327,8 @@ public:
         DirectConnection,
         QueuedConnection,
         AutoCompatConnection,
-        BlockingQueuedConnection
+        BlockingQueuedConnection,
+        UniqueConnection =  0x80
     };
 
     enum ShortcutContext {