Clear font style in afterEach so it doesn't cause test pollution

spec/app/editor-spec.coffee

@@ -541,6 +541,9 @@ describe "Editor", ->
       expect($("head style.font-family")).not.toExist()
 
     describe "when the font family changes", ->
+      afterEach ->
+        editor.clearFontFamily()
+
       it "updates the font family on new and existing editors", ->
         rootView.attachToDom()
         rootView.height(200)
@@ -549,7 +552,7 @@ describe "Editor", ->
         config.set("editor.fontFamily", "Courier")
         newEditor = editor.splitRight()
 
-        expect($("head style.font-family").text()).toMatch "{font-family: Courier}"
+        expect($("head style.editor-font-family").text()).toMatch "{font-family: Courier}"
         expect(editor.css('font-family')).toBe 'Courier'
         expect(newEditor.css('font-family')).toBe 'Courier'
 
@@ -560,7 +563,7 @@ describe "Editor", ->
 
         lineHeightBefore = editor.lineHeight
         charWidthBefore = editor.charWidth
-        config.set("editor.fontFamily", "Inconsolata")
+        config.set("editor.fontFamily", "Courier")
         editor.setCursorScreenPosition [5, 6]
         expect(editor.charWidth).not.toBe charWidthBefore
         expect(editor.getCursorView().position()).toEqual { top: 5 * editor.lineHeight, left: 6 * editor.charWidth }

src/app/editor.coffee

@@ -742,9 +742,9 @@ class Editor extends View
   setFontFamily: (fontFamily) ->
     return if fontFamily == undefined
     headTag = $("head")
-    styleTag = headTag.find("style.font-family")
+    styleTag = headTag.find("style.editor-font-family")
     if styleTag.length == 0
-      styleTag = $$ -> @style class: 'font-family'
+      styleTag = $$ -> @style class: 'editor-font-family'
       headTag.append styleTag
 
     styleTag.text(".editor {font-family: #{fontFamily}}")
@@ -752,6 +752,9 @@ class Editor extends View
 
   getFontFamily: -> @css("font-family")
 
+  clearFontFamily: ->
+    $('head style.editor-font-family').remove()
+
   redraw: ->
     return unless @hasParent()
     return unless @attached