[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)

2 files changed, 20 insertions, 2 deletions

diff --git a/addons/im_support/static/src/js/mail_manager.js b/addons/im_support/static/src/js/mail_manager.js
index b25b47cc1ba..56ea4b736b6 100644
--- a/addons/im_support/static/src/js/mail_manager.js
+++ b/addons/im_support/static/src/js/mail_manager.js
@@ -169,7 +169,12 @@ MailManager.include({
      */
     _makeChannel: function (data, options) {
         if (data.id === this.supportChannelUUID) {
-            return new SupportChannel(this, data, options, this._commands);
+            return new SupportChannel({
+                parent: this,
+                data: data,
+                options: options,
+                commands: this._commands
+            });
         }
         return this._super.apply(this, arguments);
     },
diff --git a/addons/im_support/static/src/js/support_channel.js b/addons/im_support/static/src/js/support_channel.js
index adcf2a0c51e..dee74a6650d 100644
--- a/addons/im_support/static/src/js/support_channel.js
+++ b/addons/im_support/static/src/js/support_channel.js
@@ -20,7 +20,20 @@ var _t = core._t;
  * mail.model.ThreadWithCache
  */
 var SupportChannel = ThreadWithCache.extend({
-    init: function (parent, data, options) {
+    /**
+     * @param {Object} params
+     * @param {Object} params.data
+     * @param {boolean} params.data.available
+     * @param {string|integer} params.data.id
+     * @param {boolean} params.data.is_minimized
+     * @param {Object} params.data.operator
+     * @param {string} params.data.state ['open', 'closed', 'folded']
+     * @param {string} params.data.uuid
+     * @param {string} params.data.welcome_message
+     * @param {Object} params.options
+     */
+    init: function (params) {
+        var data = params.data;
 
         data.type = 'support_channel';
         data.name = _t("Support");