From c5906fa0b9eab4d4519d80660ed5794266eb7340 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 29 Apr 2015 07:03:56 +0530
Subject: [PATCH] Do not allow user to hide all columns in book list via the
 context menu

---
 src/calibre/gui2/library/views.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/calibre/gui2/library/views.py b/src/calibre/gui2/library/views.py
index f415db0834..f88dfc5346 100644
--- a/src/calibre/gui2/library/views.py
+++ b/src/calibre/gui2/library/views.py
@@ -260,6 +260,9 @@ class BooksView(QTableView):  # {{{
         h = self.column_header
 
         if action == 'hide':
+            if h.hiddenSectionCount() >= h.count():
+                return error_dialog(self, _('Cannot hide all columns'), _(
+                    'You must not hide all columns'), show=True)
             h.setSectionHidden(idx, True)
         elif action == 'show':
             h.setSectionHidden(idx, False)