Add https_proxy env variable

This forces Python to use the HTTP proxy for HTTPS connections.

src/core/bittorrent/session.cpp

@@ -1828,9 +1828,10 @@ void Session::setProxySettings(libt::proxy_settings proxySettings)
     proxySettings.proxy_peer_connections = Preferences::instance()->proxyPeerConnections();
     m_nativeSession->set_proxy(proxySettings);
 
-    // Define environment variable for urllib in search engine plugins
+    // Define environment variables for urllib in search engine plugins
     if (Preferences::instance()->isProxyOnlyForTorrents()) {
         qputenv("http_proxy", QByteArray());
+        qputenv("https_proxy", QByteArray());
         qputenv("sock_proxy", QByteArray());
     }
     else {
@@ -1853,14 +1854,17 @@ void Session::setProxySettings(libt::proxy_settings proxySettings)
         default:
             qDebug("Disabling HTTP communications proxy");
             qputenv("http_proxy", QByteArray());
+            qputenv("https_proxy", QByteArray());
             qputenv("sock_proxy", QByteArray());
             return;
         }
         qDebug("HTTP communications proxy string: %s", qPrintable(proxy_str));
         if ((proxySettings.type == libt::proxy_settings::socks5) || (proxySettings.type == libt::proxy_settings::socks5_pw))
             qputenv("sock_proxy", proxy_str.toLocal8Bit());
-        else
+        else {
             qputenv("http_proxy", proxy_str.toLocal8Bit());
+            qputenv("https_proxy", proxy_str.toLocal8Bit());
+        }
     }
 }