[IMP] mail, *: template rendering with abstract thread, adapt thread instantiation, thread `getMessages`/`fetchMessages`, and create mode document thread.

* = im_livechat, im_support

- thread widget now uses abstract thread in `render` method
- thread models have their `init` parameters changed, so that the parent may be optional
- reworked 'creating a new record...' in chatter in create mode:
    > new model CreateModeDocumentThread, which basically is a fake document thread
      with a fake message for its rendering in create mode of the chatter
    > special rendering method of thread_widget for such case: `renderChatterCreateMode`
- renamed thread methods previously named `getMessages` to `fetchMessages`:
    > in order to not conflict with `getMessages`, used for rendering
    > now, `getMessages` always get messages that are locally,
      while `fetchMessages` may fetch messages.

TODO:
    - special thread model for im_livechat (rendering is broken ATM)

1 files changed, 16 insertions, 11 deletions

diff --git a/addons/mail/static/src/js/thread_windows/abstract_thread_window.js b/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
index ae756b6f624..3325cd8be43 100644
--- a/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
+++ b/addons/mail/static/src/js/thread_windows/abstract_thread_window.js
@@ -46,12 +46,14 @@ var AbstractThreadWindow = Widget.extend({
      *
      * @abstract
      * @param {Widget} parent
-     * @param {Object} thread
+     * @param {Object} thread the thread that this thread window is linked to.
      * @param {Object} [options={}]
      */
     init: function (parent, thread, options) {
         this._super(parent);
 
+        this._thread = thread;
+
         this.options = _.defaults(options || {}, {
             autofocus: true,
             displayStars: true,
@@ -174,15 +176,11 @@ var AbstractThreadWindow = Widget.extend({
         return this._hidden;
     },
     /**
-     * Render the thread window, using the provided list of messages
-     *
-     * TODO: use messages in thread, instead of providing list of messages
-     *
-     * @param {mail.model.AbstractMessage[]} messages
+     * Render the thread window
      */
-    render: function (messages) {
+    render: function () {
         this._renderHeader();
-        this.threadWidget.render(messages, { displayLoadMore: false });
+        this.threadWidget.render(this._thread, { displayLoadMore: false });
     },
     /**
      * Toggle the fold state of this thread window. Also update the fold state
@@ -256,12 +254,19 @@ var AbstractThreadWindow = Widget.extend({
     },
     /**
      * Get the ID of the related thread.
+     * If this window is not related to a thread, it means this is the "blank"
+     * thread window, therefore it returns "_blank" as its ID.
      *
-     * @abstract
      * @private
-     * @return {integer}
+     * @returns {integer|string} the threadID, or '_blank' for the window that
+     *   is not related to any thread.
      */
-    _getThreadID: function () {},
+    _getThreadID: function () {
+        if (!this.hasThread()) {
+            return '_blank';
+        }
+        return this._thread.getID();
+    },
     /**
      * Post a message on this thread window
      *