From 4b4e8cdf7d1697ef4e04eb062db2a7ab395d24e1 Mon Sep 17 00:00:00 2001
From: niv-openerp <nicolas.vanhoren@openerp.com>
Date: Tue, 28 Jun 2011 18:22:06 +0200
Subject: [PATCH] [fix] fixed some problems with m2o (too much on_change and
 "theorically unreachable state")

bzr revid: nicolas.vanhoren@openerp.com-20110628162206-3dowhy9t5ffj2mzp
---
 addons/base/static/src/js/form.js | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/addons/base/static/src/js/form.js b/addons/base/static/src/js/form.js
index b2c74c920c3..8044c425661 100644
--- a/addons/base/static/src/js/form.js
+++ b/addons/base/static/src/js/form.js
@@ -1277,9 +1277,15 @@ openerp.base.form.FieldMany2One = openerp.base.form.Field.extend({
     },
     _change_int_value: function(value) {
         this.value = value;
-        if (this.original_value === undefined || (this.value !== undefined &&
-            ((this.original_value ? this.original_value[0] : null) !== (this.value ? this.value[0] : null)))) {
-            this.original_value = undefined;
+        var back_orig_value = this.original_value;
+        if (this.value === null || this.value) {
+            this.original_value = this.value;
+        }
+        if (back_orig_value === undefined) { // first use after a set_value()
+            return;
+        }
+        if (this.value !== undefined && ((back_orig_value ? back_orig_value[0] : null)
+                !== (this.value ? this.value[0] : null))) {
             this.on_ui_change();
         }
     },
@@ -1292,7 +1298,7 @@ openerp.base.form.FieldMany2One = openerp.base.form.Field.extend({
         var real_set_value = function(rval) {
             self.tmp_value = undefined;
             _super.apply(self, rval);
-            self.original_value = rval;
+            self.original_value = undefined;
             self._change_int_ext_value(rval);
         };
         if(typeof(value) === "number") {
@@ -1312,7 +1318,7 @@ openerp.base.form.FieldMany2One = openerp.base.form.Field.extend({
             return this.tmp_value ? this.tmp_value : false;
         }
         if (this.value === undefined)
-            throw "theorically unreachable state";
+            return this.original_value ? this.original_value[0] : false;
         return this.value ? this.value[0] : false;
     },
     validate: function() {