[9.0] Improve document_page (#162)

* [document_page] FIX creating history when there are no changes made. Add history name field, to name revisions. Modified views to allow setting this field.

* [document_page] FIX BUG: UI hanging when editing content. This was due to the api.depends on _compute_diff. Removing it because it's not really necessary since the field is not stored.

* [document_page] page_id should be readonly.

* [document_page] Implement active field

* [document_page] Update version number

document_page/models/document_page.py

@@ -39,6 +39,8 @@ class DocumentPage(models.Model):
         default="content"
     )
 
+    active = fields.Boolean(default=True)
+
     parent_id = fields.Many2one(
         'document.page',
         'Category',
@@ -60,7 +62,16 @@ class DocumentPage(models.Model):
     )
 
     # no-op computed field
-    summary = fields.Char(
+    draft_name = fields.Char(
+        string='Name',
+        help='Name for the changes made',
+        compute=lambda x: x,
+        inverse=lambda x: x,
+    )
+
+    # no-op computed field
+    draft_summary = fields.Char(
+        string='Summary',
         help='Describe the changes made',
         compute=lambda x: x,
         inverse=lambda x: x,
@@ -156,10 +167,12 @@ class DocumentPage(models.Model):
     @api.multi
     def _inverse_content(self):
         for rec in self:
-            if rec.type == 'content':
+            if rec.type == 'content' and \
+                    rec.content != rec.history_head.content:
                 rec._create_history({
+                    'name': rec.draft_name,
+                    'summary': rec.draft_summary,
                     'content': rec.content,
-                    'summary': rec.summary,
                 })
 
     @api.multi