Show all annotations on the stream page

The stream page was broken - showing only annotations from the group
that was focused the last time the user was using the sidebar.

Fix it to show annotations from all groups.

h/static/scripts/directive/test/thread-test.coffee

@@ -158,8 +158,14 @@ describe 'thread', ->
               id: 123
               group: 'wibble'
 
-        it 'is false when the focused group does not match', ->
+        it 'is false for draft annotations not from the focused group', ->
+          # Set the focused group to one other than the annotation's group.
           fakeGroups.focused.returns({id: 'foo'})
+
+          # Make the annotation into a "draft" annotation (make isNew() return
+          # true).
+          delete controller.container.message.id
+
           assert.isFalse(controller.shouldShow())
 
         it 'is true when the focused group does match', ->

h/static/scripts/directive/thread.coffee

@@ -44,11 +44,12 @@ ThreadController = [
     # current system state.
     ###
     this.shouldShow = ->
-      # If the annotation has a group set, then hide it if it doesn't belong to
-      # the focused group. This is mainly important for drafts, which are
-      # persisted across route reloads.
+      # Hide "draft" annotations (new annotations that haven't been saved to
+      # the server yet) that don't belong to the focused group. These draft
+      # annotations persist across route reloads so they have to be hidden
+      # here.
       group = this.container?.message?.group
-      if group and group != groups.focused().id
+      if this.isNew() and group and group != groups.focused().id
         return false
 
       if this.container?.message?.$orphan == true