[Gutter] Fix coffeescript style issues

src/custom-gutter-component.coffee

@@ -32,7 +32,7 @@ class CustomGutterComponent
     newDimensionsAndBackgroundState = state.gutters
     setDimensionsAndBackground(@oldDimensionsAndBackgroundState, newDimensionsAndBackgroundState, @decorationsNode)
 
-    @oldDecorationPositionState ?= {};
+    @oldDecorationPositionState ?= {}
     decorationState = state.gutters.customDecorations[@gutter.name]
 
     updatedDecorationIds = new Set
@@ -59,7 +59,7 @@ class CustomGutterComponent
 
   # Builds and returns an HTMLElement to represent the specified decoration.
   buildDecorationNode: (decorationId, decorationInfo) ->
-    @oldDecorationPositionState[decorationId] = {};
+    @oldDecorationPositionState[decorationId] = {}
     newNode = document.createElement('div')
     newNode.style.position = 'absolute'
     @updateDecorationNode(newNode, decorationId, decorationInfo)
@@ -68,7 +68,7 @@ class CustomGutterComponent
   # Updates the existing HTMLNode with the new decoration info. Attempts to
   # minimize changes to the DOM.
   updateDecorationNode: (node, decorationId, newDecorationInfo) ->
-    oldPositionState = @oldDecorationPositionState[decorationId];
+    oldPositionState = @oldDecorationPositionState[decorationId]
 
     if oldPositionState.top isnt newDecorationInfo.top + 'px'
       node.style.top = newDecorationInfo.top + 'px'

src/gutter-container-component.coffee

@@ -72,7 +72,7 @@ class GutterContainerComponent
           existingGutterComponentDescription = @gutterComponents[indexInOldGutters]
           existingGutterComponent = existingGutterComponentDescription.component
           indexInOldGutters++
-          if existingGutterComponent == gutterComponent
+          if existingGutterComponent is gutterComponent
             matchingGutterFound = true
             break
         if not matchingGutterFound
@@ -82,7 +82,7 @@ class GutterContainerComponent
           @domNode.appendChild(gutterComponent.getDomNode())
 
       else
-        if indexInOldGutters == oldGuttersLength
+        if indexInOldGutters is oldGuttersLength
           @domNode.appendChild(gutterComponent.getDomNode())
         else
           @domNode.insertBefore(gutterComponent.getDomNode(), @domNode.children[indexInOldGutters])

src/gutter-container.coffee

@@ -30,7 +30,7 @@ class GutterContainer
   addGutter: (options) ->
     options = options ? {}
     gutterName = options.name
-    if gutterName == null
+    if gutterName is null
       throw new Error('A name is required to create a gutter.')
     if @gutterWithName(gutterName)
       throw new Error('Tried to create a gutter with a name that is already in use.')
@@ -54,7 +54,7 @@ class GutterContainer
 
   gutterWithName: (name) ->
     for gutter in @gutters
-      if gutter.name == name then return gutter
+      if gutter.name is name then return gutter
     null
 
   ###

src/text-editor-presenter.coffee

@@ -388,9 +388,9 @@ class TextEditorPresenter
 
   updateCommonGutterState: ->
     @state.gutters.backgroundColor = if @gutterBackgroundColor isnt "rgba(0, 0, 0, 0)"
-        @gutterBackgroundColor
-      else
-        @backgroundColor
+      @gutterBackgroundColor
+    else
+      @backgroundColor
 
   didAddGutter: (gutter) ->
     gutterDisposables = new CompositeDisposable