Update selected operation on move-to-top/move-to-bottom

src/packages/command-panel/spec/command-panel-spec.coffee

@@ -429,6 +429,21 @@ describe "CommandPanel", ->
         expect(previewList.find('li.operation:eq(0)')).toHaveClass 'selected'
         expect(commandPanel.miniEditor.getText()).toBe 'command'
 
+    describe "when move-to-top and move-to-bottom are triggered on the preview list", ->
+      it "selects the first/last operation", ->
+        rootView.attachToDom()
+        expect(previewList.getOperations().length).toBeGreaterThan 0
+        expect(previewList.find('li.operation:eq(0)')).toHaveClass 'selected'
+        expect(previewList.getSelectedOperation()).toBe previewList.getOperations()[0]
+
+        previewList.trigger 'core:move-to-bottom'
+        expect(previewList.find('li.operation:last')).toHaveClass 'selected'
+        expect(previewList.getSelectedOperation()).toBe _.last(previewList.getOperations())
+
+        previewList.trigger 'core:move-to-top'
+        expect(previewList.find('li.operation:eq(0)')).toHaveClass 'selected'
+        expect(previewList.getSelectedOperation()).toBe previewList.getOperations()[0]
+
     describe "when core:confirm is triggered on the preview list", ->
       it "opens the operation's buffer, selects and scrolls to the search result, and focuses the active editor", ->
         rootView.height(200)

src/packages/command-panel/src/preview-list.coffee

@@ -67,16 +67,19 @@ class PreviewList extends ScrollView
     else
       @setSelectedOperationIndex(@selectedOperationIndex - 1)
 
-  setSelectedOperationIndex: (index) ->
+  setSelectedOperationIndex: (index, scrollToOperation=true) ->
     index = Math.max(0, index)
     index = Math.min(@operations.length - 1, index)
     @children(".selected").removeClass('selected')
     element = @children("li.operation:eq(#{index})")
     element.addClass('selected')
-    if index is 0
-      @scrollToTop()
-    else
-      @scrollToElement(element)
+
+    if scrollToOperation
+      if index is 0
+        @scrollToTop()
+      else
+        @scrollToElement(element)
+
     @selectedOperationIndex = index
 
   executeSelectedOperation: ->
@@ -105,3 +108,13 @@ class PreviewList extends ScrollView
       @scrollBottom(bottom)
     if top < @scrollTop()
       @scrollTop(top)
+
+  scrollToBottom: ->
+    super()
+
+    @setSelectedOperationIndex(Infinity, false)
+
+  scrollToTop: ->
+    super()
+
+    @setSelectedOperationIndex(0, false)