From c4bef937a1dd5b124554b6dfe7f59417cf614c7f Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Tue, 24 Jan 2012 23:18:40 +0900
Subject: [PATCH] make sure the user can't disable all columns

---
 aqt/browser.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/aqt/browser.py b/aqt/browser.py
index db4e6594b..d2c19c69a 100644
--- a/aqt/browser.py
+++ b/aqt/browser.py
@@ -568,6 +568,8 @@ class Browser(QMainWindow):
     def toggleField(self, type):
         self.model.beginReset()
         if type in self.model.activeCols:
+            if len(self.model.activeCols) < 2:
+                return showInfo(_("You must have at least one column."))
             self.model.activeCols.remove(type)
         else:
             self.model.activeCols.append(type)