From 40714d02c57457fef5138a2368cc8a5a4c0545fe Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Sun, 25 Jan 2015 06:19:25 +0530
Subject: [PATCH] Tag browser: Allow expanding all children of a node by right
 clicking and choosing Expand All. Fixes #1414315 [[Enhancement] Auto
 Expanding All Categories/Subcat
 Option](https://bugs.launchpad.net/calibre/+bug/1414315)

---
 src/calibre/gui2/tag_browser/view.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/calibre/gui2/tag_browser/view.py b/src/calibre/gui2/tag_browser/view.py
index 3eb3aa3373..21186b6226 100644
--- a/src/calibre/gui2/tag_browser/view.py
+++ b/src/calibre/gui2/tag_browser/view.py
@@ -616,10 +616,21 @@ class TagsView(QTreeView):  # {{{
             da.setToolTip('*')
             pa.setToolTip('*')
 
+        if index.isValid() and self.model().rowCount(index) > 0:
+            self.context_menu.addSeparator()
+            self.context_menu.addAction(_('E&xpand all children'), partial(self.expand_node_and_descendants, index))
+
         if not self.context_menu.isEmpty():
             self.context_menu.popup(self.mapToGlobal(point))
         return True
 
+    def expand_node_and_descendants(self, index):
+        if not index.isValid():
+            return
+        self.expand(index)
+        for r in xrange(self.model().rowCount(index)):
+            self.expand_node_and_descendants(index.child(r, 0))
+
     def collapse_menu_hovered(self, action):
         tip = action.toolTip()
         if tip == '*':