Improve search scope behavior

Closes #360.

assets/javascripts/views/search/search.coffee

@@ -94,6 +94,7 @@ class app.views.Search extends app.View
   clear: ->
     @removeClass @constructor.activeClass
     @trigger 'clear'
+    return
 
   externalSearch: (url) ->
     if value = @value

assets/javascripts/views/search/search_scope.coffee

@@ -48,6 +48,8 @@ class app.views.SearchScope extends app.View
     return
 
   selectDoc: (doc) ->
+    previousDoc = @doc
+    return if doc is previousDoc
     @doc = doc
 
     @tag.textContent = doc.fullName
@@ -56,9 +58,14 @@ class app.views.SearchScope extends app.View
     @input.removeAttribute 'placeholder'
     @input.value = @input.value[@input.selectionStart..]
     @input.style.paddingLeft = @tag.offsetWidth + 10 + 'px'
+
     $.trigger @input, 'input'
+    @trigger 'change', @doc, previousDoc
+    return
 
   reset: =>
+    return unless @doc
+    previousDoc = @doc
     @doc = null
 
     @tag.textContent = ''
@@ -67,6 +74,9 @@ class app.views.SearchScope extends app.View
     @input.setAttribute 'placeholder', @placeholder
     @input.style.paddingLeft = ''
 
+    @trigger 'change', null, previousDoc
+    return
+
   onKeydown: (event) =>
     return if event.ctrlKey or event.metaKey or event.altKey or event.shiftKey
 

assets/javascripts/views/sidebar/doc_list.coffee

@@ -114,10 +114,15 @@ class app.views.DocList extends app.View
   reveal: (model) ->
     @openDoc model.doc
     @openType model.getType() if model.type
+    @focus model
     @paginateTo model
     @scrollTo model
     return
 
+  focus: (model) ->
+    @listFocus.focus @find("a[href='#{model.fullPath()}']")
+    return
+
   revealCurrent: ->
     if model = app.router.context.type or app.router.context.entry
       @reveal model
@@ -128,6 +133,10 @@ class app.views.DocList extends app.View
     @listFold.open @find("[data-slug='#{doc.slug}']")
     return
 
+  closeDoc: (doc) ->
+    @listFold.close @find("[data-slug='#{doc.slug}']")
+    return
+
   openType: (type) ->
     @listFold.open @lists[type.doc.slug].find("[data-slug='#{type.slug}']")
     return

assets/javascripts/views/sidebar/sidebar.coffee

@@ -16,6 +16,8 @@ class app.views.Sidebar extends app.View
     @search
       .on 'searching', @showResults
       .on 'clear', @showDocList
+    .scope
+      .on 'change', @onScopeChange
 
     @results = new app.views.Results @, @search
     @docList = new app.views.DocList
@@ -54,6 +56,12 @@ class app.views.Sidebar extends app.View
 
   reset: ->
     @showDocList true
+    return
+
+  onScopeChange: (newDoc, previousDoc) =>
+    @docList.closeDoc(previousDoc) if previousDoc
+    if newDoc then @docList.reveal(newDoc.toEntry()) else @scrollToTop()
+    return
 
   saveScrollPosition: ->
     if @view is @docList