From 91349d109e8c6d32578f64519de09f9c3e00d28c Mon Sep 17 00:00:00 2001
From: Neil Booth <kyuupichan@gmail.com>
Date: Fri, 13 Nov 2015 23:42:46 +0900
Subject: [PATCH] Add explanatory comment.

---
 gui/qt/main_window.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index dc9a30c2..d71418dd 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -163,6 +163,10 @@ class ElectrumWindow(QMainWindow, PrintError):
             self.connect(self, QtCore.SIGNAL('network'), self.on_network_qt)
             interests = ['updated', 'new_transaction', 'status',
                          'banner', 'verified']
+            # To avoid leaking references to "self" that prevent the
+            # window from being GC-ed when closed, callbacks should be
+            # methods of this class only, and specifically not be
+            # partials, lambdas or methods of subobjects.  Hence...
             self.network.register_callback(self.on_network, interests)
             # set initial message
             self.console.showMessage(self.network.banner)