EXP-1465 FIX Crash in IM panel destructor

indra/newview/llimfloatercontainer.cpp

@@ -47,12 +47,13 @@ LLIMFloaterContainer::LLIMFloaterContainer(const LLSD& seed)
 
 LLIMFloaterContainer::~LLIMFloaterContainer()
 {
+	mNewMessageConnection.disconnect();
 	LLTransientFloaterMgr::getInstance()->removeControlView(LLTransientFloaterMgr::IM, this);
 }
 
 BOOL LLIMFloaterContainer::postBuild()
 {
-	LLIMModel::instance().mNewMsgSignal.connect(boost::bind(&LLIMFloaterContainer::onNewMessageReceived, this, _1));
+	mNewMessageConnection = LLIMModel::instance().mNewMsgSignal.connect(boost::bind(&LLIMFloaterContainer::onNewMessageReceived, this, _1));
 	// Do not call base postBuild to not connect to mCloseSignal to not close all floaters via Close button
 	// mTabContainer will be initialized in LLMultiFloater::addChild()
 	return TRUE;

indra/newview/llimfloatercontainer.h

@@ -62,7 +62,7 @@ class LLIMFloaterContainer : public LLMultiFloater
 private:
 	typedef std::map<LLUUID,LLFloater*> avatarID_panel_map_t;
 	avatarID_panel_map_t mSessions;
-
+	boost::signals2::connection mNewMessageConnection;
 
 	void onNewMessageReceived(const LLSD& data);
 };