[meld] meldwindow: Re-add comment explaining switch-page signal insanity

[Kai Willadsen <kaiw src gnome org>]

commit c88024e53585fee6c4d94eda1370f4d684a44490
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sat Jan 23 08:59:38 2016 +1000

    meldwindow: Re-add comment explaining switch-page signal insanity

 meld/meldwindow.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meld/meldwindow.py b/meld/meldwindow.py
index 87b13a4..70d2885 100644
--- a/meld/meldwindow.py
+++ b/meld/meldwindow.py
@@ -600,6 +600,8 @@ class MeldWindow(gnomeglade.Component):
         page_num = self.notebook.page_num(page.widget)
 
         self.notebook.remove_page(page_num)
+        # Normal switch-page handlers don't get run for removing the
+        # last page from a notebook.
         if not self.has_pages():
             self.on_switch_page(self.notebook, page, -1)
             self._update_page_action_sensitivity()