Scroll to top when selecting first element

This ensures that the top path is always visible
when the first operation is selected.

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

@@ -402,7 +402,8 @@ describe "CommandPanel", ->
 
         expect(previewList.scrollBottom()).toBeCloseTo previewList.prop('scrollHeight'), -1
 
-        _.times previewList.getOperations().length, -> previewList.trigger 'core:move-up'
+        previewList.trigger 'core:move-down'
+        expect(previewList.scrollTop()).toBe 0
 
       it "wraps around when the list is at the beginning or end", ->
         rootView.attachToDom()

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

@@ -73,7 +73,10 @@ class PreviewList extends ScrollView
     @children(".selected").removeClass('selected')
     element = @children("li.operation:eq(#{index})")
     element.addClass('selected')
-    @scrollToElement(element)
+    if index is 0
+      @scrollToTop()
+    else
+      @scrollToElement(element)
     @selectedOperationIndex = index
 
   executeSelectedOperation: ->