QNAM: Work around QObject finicky orphan cleanup details

Details described in a comment.

Task-number: QTBUG-88063
Pick-to: 5.15
Change-Id: I763ecfedf518de97615e04a8eaae0fe1fd784f52
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 11 insertions, 1 deletions

diff --git a/src/network/access/qnetworkreplyhttpimpl.cpp b/src/network/access/qnetworkreplyhttpimpl.cpp
index 921b482d10..555b609433 100644
--- a/src/network/access/qnetworkreplyhttpimpl.cpp
+++ b/src/network/access/qnetworkreplyhttpimpl.cpp
@@ -791,7 +791,17 @@ void QNetworkReplyHttpImplPrivate::postRequest(const QNetworkRequest &newHttpReq
 
     // For the synchronous HTTP, this is the normal way the delegate gets deleted
     // For the asynchronous HTTP this is a safety measure, the delegate deletes itself when HTTP is finished
-    QObject::connect(thread, SIGNAL(finished()), delegate, SLOT(deleteLater()));
+    QMetaObject::Connection threadFinishedConnection =
+            QObject::connect(thread, SIGNAL(finished()), delegate, SLOT(deleteLater()));
+
+    // QTBUG-88063: When 'delegate' is deleted the connection will be added to 'thread''s orphaned
+    // connections list. This orphaned list will be cleaned up next time 'thread' emits a signal,
+    // unfortunately that's the finished signal. It leads to a soft-leak so we do this to disconnect
+    // it on deletion so that it cleans up the orphan immediately.
+    QObject::connect(delegate, &QObject::destroyed, delegate, [threadFinishedConnection]() {
+        if (bool(threadFinishedConnection))
+            QObject::disconnect(threadFinishedConnection);
+    });
 
     // Set the properties it needs
     delegate->httpRequest = httpRequest;