fix: app freeze on quit (#1804)

* fix: app freeze on quit

* fix: typo in VpnConnection destructor

* add trace info

* add more trace info

* set timelimit for flushDns

* Refactor IpcClient::Interface access logic

* cleanup unused variable

* cleanup trace info

* fix: remove second disconnect from VPN on app close

* this object will be deleted at app close

* Don't terminate VPN thread on Linux

* Revert "Don't terminate VPN thread on Linux"

This reverts commit 20e4ea2d4a.

* disconnect all signals from vpnconnection on exit

* add interruption request on vpnConnectionThread

* use checktimer only for iOS

* disconnect all signals from vpnconnection on exit

* disconnect signals on exit before VPN disconnect

* add disconnectSlots method

* fix: add allow traffic rules on killswitch disable

* wait for response from service before object destroy

* change disconnect from vpn order

* add delay for connection close

* change disconnect method order

* use stop method for protocol disconnecect

* change disconnect method order

* allow dns traffic after app close

* delete tun on disconnect

---------

Co-authored-by: vkamn <vk@amnezia.org>

client/core/ipcclient.cpp

@@ -85,8 +85,9 @@ bool IpcClient::init(IpcClient *instance)
     }
 
     qDebug() << "IpcClient::init succeed";
+    instance->m_isSocketConnected = (Instance()->m_ipcClient->isReplicaValid() && Instance()->m_Tun2SocksClient->isReplicaValid());
 
-    return (Instance()->m_ipcClient->isReplicaValid() && Instance()->m_Tun2SocksClient->isReplicaValid());
+    return Instance()->isSocketConnected();
 }
 
 QSharedPointer<PrivilegedProcess> IpcClient::CreatePrivilegedProcess()