feat(all-mail): Add special case * tag for all mail

Summary: This one is a bit interesting. We want to allow the user to view "All Mail", which is essentially "threads, with no tags query whatsoever." Rather than try to make `null` a valid selected tag Id, I used `*` as a "magic" tag id which is interpreted by the ThreadStore to mean "no tags where clause." Definitely a hack, but simpler than trying to make the account sidebar properly select "all mail" when selectedTagId = null.

Test Plan: Run tests

Reviewers: evan

Reviewed By: evan

Differential Revision: https://review.inboxapp.com/D1360

internal_packages/account-sidebar/lib/account-sidebar-store.coffee

@@ -61,6 +61,7 @@ AccountSidebarStore = Reflux.createStore
 
       # Sort the main tags so they always appear in a standard order
       mainTags = _.sortBy mainTags, (tag) -> mainTagIDs.indexOf(tag.id)
+      mainTags.push new Tag(name: 'All Mail', id: '*')
 
       lastSections = @_sections
       @_sections = [

src/flux/stores/thread-store.coffee

@@ -45,10 +45,12 @@ ThreadStore = Reflux.createStore
 
     start = Date.now()
 
-    DatabaseStore.findAll(Thread, [
-      Thread.attributes.namespaceId.equal(@_namespaceId),
-      Thread.attributes.tags.contains(@_tagId)
-    ]).limit(100).then (items) =>
+    matchers = []
+    matchers.push Thread.attributes.namespaceId.equal(@_namespaceId)
+    if @_tagId and @_tagId isnt "*"
+      matchers.push Thread.attributes.tags.contains(@_tagId)
+
+    DatabaseStore.findAll(Thread).where(matchers).limit(100).then (items) =>
       # Now, fetch the messages for each thread. We could do this with a
       # complex join, but then we'd get thread columns repeated over and over.
       # This is reasonably fast because we don't store message bodies in messages
@@ -122,7 +124,10 @@ ThreadStore = Reflux.createStore
         @_items = items
         doneLoading()
     else
-      atom.inbox.getThreads(@_namespaceId, {tag: @_tagId}, {success: doneLoading, error: doneLoading})
+      params = {}
+      if @_tagId and @_tagId isnt "*"
+        params = {tag: @_tagId}
+      atom.inbox.getThreads(@_namespaceId, params, {success: doneLoading, error: doneLoading})
 
   # Inbound Events