From 08dffd890fd3b84580fc672a66798b6e66843089 Mon Sep 17 00:00:00 2001
From: Charles Haley <github@charles.haleys.org>
Date: Sat, 21 Nov 2015 15:12:07 +0100
Subject: [PATCH] Recover the memory used to process intermediate nodes.

---
 src/calibre/gui2/tag_browser/model.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/calibre/gui2/tag_browser/model.py b/src/calibre/gui2/tag_browser/model.py
index f3d3bb178f..02f9cd5cfe 100644
--- a/src/calibre/gui2/tag_browser/model.py
+++ b/src/calibre/gui2/tag_browser/model.py
@@ -596,6 +596,7 @@ class TagsModel(QAbstractItemModel):  # {{{
         for category in self.category_nodes:
             process_one_node(category, collapse_model,
                              state_map.get(category.category_key, {}))
+        self.intermediate_nodes = None
 
         # Fix up the node tree, reordering as needed and deleting undisplayed nodes
         new_children = []