diff --git a/package.json b/package.json
index 0bd8c92a2..6f0598b16 100644
--- a/package.json
+++ b/package.json
@@ -72,9 +72,9 @@
     "archive-view": "0.32.0",
     "autocomplete": "0.28.0",
     "autoflow": "0.17.0",
-    "autosave": "0.13.0",
+    "autosave": "0.14.0",
     "background-tips": "0.14.0",
-    "bookmarks": "0.23.0",
+    "bookmarks": "0.24.0",
     "bracket-matcher": "0.45.0",
     "command-palette": "0.22.0",
     "deprecation-cop": "0.6.0",
@@ -83,7 +83,7 @@
     "feedback": "0.33.0",
     "find-and-replace": "0.115.0",
     "fuzzy-finder": "0.54.0",
-    "git-diff": "0.29.0",
+    "git-diff": "0.30.0",
     "go-to-line": "0.22.0",
     "grammar-selector": "0.27.0",
     "image-view": "0.35.0",
@@ -96,7 +96,7 @@
     "release-notes": "0.32.0",
     "settings-view": "0.120.0",
     "snippets": "0.45.0",
-    "spell-check": "0.36.0",
+    "spell-check": "0.37.0",
     "status-bar": "0.40.0",
     "styleguide": "0.29.0",
     "symbols-view": "0.55.0",
diff --git a/spec/editor-component-spec.coffee b/spec/editor-component-spec.coffee
index b9cd3e3a0..b827622c1 100644
--- a/spec/editor-component-spec.coffee
+++ b/spec/editor-component-spec.coffee
@@ -1072,8 +1072,6 @@ describe "EditorComponent", ->
 
       expect(horizontalScrollbarNode.scrollWidth).toBe gutterNode.offsetWidth + editor.getScrollWidth()
 
-    describe "when a mousewheel event occurs on the editor", ->
-
   describe "mousewheel events", ->
     it "updates the scrollLeft or scrollTop on mousewheel events depending on which delta is greater (x or y)", ->
       node.style.height = 4.5 * lineHeightInPixels + 'px'
@@ -1184,6 +1182,12 @@ describe "EditorComponent", ->
       inputNode.dispatchEvent(new Event('input'))
       expect(editor.lineForBufferRow(0)).toBe 'üvar quicksort = function () {'
 
+    it "does not handle input events when input is disabled", ->
+      component.setInputEnabled(false)
+      inputNode.value = 'x'
+      inputNode.dispatchEvent(new Event('input'))
+      expect(editor.lineForBufferRow(0)).toBe 'var quicksort = function () {'
+
   describe "commands", ->
     describe "editor:consolidate-selections", ->
       it "consolidates selections on the editor model, aborting the key binding if there is only one selection", ->
diff --git a/spec/editor-view-spec.coffee b/spec/editor-view-spec.coffee
index 990ca47a7..c6d043d64 100644
--- a/spec/editor-view-spec.coffee
+++ b/spec/editor-view-spec.coffee
@@ -10,6 +10,8 @@ describe "EditorView", ->
   [buffer, editorView, editor, cachedEditor, cachedLineHeight, cachedCharWidth, fart] = []
 
   beforeEach ->
+    atom.config.set 'core.useReactEditor', false
+
     waitsForPromise ->
       atom.workspace.open('sample.js').then (o) -> editor = o
 
diff --git a/spec/pane-container-spec.coffee b/spec/pane-container-spec.coffee
index 44f99a6b2..df9921e69 100644
--- a/spec/pane-container-spec.coffee
+++ b/spec/pane-container-spec.coffee
@@ -16,6 +16,7 @@ describe "PaneContainer", ->
       containerA = new PaneContainer(root: pane1A)
       pane2A = pane1A.splitRight(items: [new Item])
       pane3A = pane2A.splitDown(items: [new Item])
+      pane3A.focus()
 
     it "preserves the focused pane across serialization", ->
       expect(pane3A.focused).toBe true
diff --git a/spec/pane-spec.coffee b/spec/pane-spec.coffee
index 7ff32a083..04b1c2474 100644
--- a/spec/pane-spec.coffee
+++ b/spec/pane-spec.coffee
@@ -439,10 +439,11 @@ describe "Pane", ->
           expect(column.orientation).toBe 'vertical'
           expect(column.children).toEqual [pane1, pane3, pane2]
 
-    it "sets up the new pane to be focused", ->
-      expect(pane1.focused).toBe false
+    it "activates the new pane", ->
+      expect(pane1.isActive()).toBe true
       pane2 = pane1.splitRight()
-      expect(pane2.focused).toBe true
+      expect(pane1.isActive()).toBe false
+      expect(pane2.isActive()).toBe true
 
   describe "::destroy()", ->
     [container, pane1, pane2] = []
diff --git a/spec/pane-view-spec.coffee b/spec/pane-view-spec.coffee
index 8d3d3be27..9f73884b5 100644
--- a/spec/pane-view-spec.coffee
+++ b/spec/pane-view-spec.coffee
@@ -199,6 +199,7 @@ describe "PaneView", ->
 
       it "focuses the next pane", ->
         container.attachToDom()
+        pane2.activate()
         expect(pane.hasFocus()).toBe false
         expect(pane2.hasFocus()).toBe true
         pane2Model.destroy()
diff --git a/spec/spec-helper.coffee b/spec/spec-helper.coffee
index fcb052962..bf00f93a3 100644
--- a/spec/spec-helper.coffee
+++ b/spec/spec-helper.coffee
@@ -89,7 +89,7 @@ beforeEach ->
   config.set "editor.autoIndent", false
   config.set "core.disabledPackages", ["package-that-throws-an-exception",
     "package-with-broken-package-json", "package-with-broken-keymap"]
-  config.set "core.useReactEditor", false
+  config.set "core.useReactEditor", true
   config.save.reset()
   atom.config = config
 
diff --git a/spec/workspace-view-spec.coffee b/spec/workspace-view-spec.coffee
index e2b2dada9..3f7a32259 100644
--- a/spec/workspace-view-spec.coffee
+++ b/spec/workspace-view-spec.coffee
@@ -201,7 +201,9 @@ describe "WorkspaceView", ->
       expect(rightEditorView.find(".line:first").text()).toBe "    "
       expect(leftEditorView.find(".line:first").text()).toBe "    "
 
-      withInvisiblesShowing = "#{rightEditorView.invisibles.space}#{rightEditorView.invisibles.tab} #{rightEditorView.invisibles.space}#{rightEditorView.invisibles.eol}"
+      {invisibles} = rightEditorView.component.state
+      {space, tab, eol} = invisibles
+      withInvisiblesShowing = "#{space}#{tab} #{space}#{eol}"
 
       atom.workspaceView.trigger "window:toggle-invisibles"
       expect(rightEditorView.find(".line:first").text()).toBe withInvisiblesShowing
diff --git a/src/display-buffer.coffee b/src/display-buffer.coffee
index 3ef72d8e8..0a128fb41 100644
--- a/src/display-buffer.coffee
+++ b/src/display-buffer.coffee
@@ -230,8 +230,7 @@ class DisplayBuffer extends Model
     @charWidthsByScope = {}
 
   getScrollHeight: ->
-    unless @getLineHeightInPixels() > 0
-      throw new Error("You must assign lineHeightInPixels before calling ::getScrollHeight()")
+    return 0 unless @getLineHeightInPixels() > 0
 
     @getLineCount() * @getLineHeightInPixels()
 
@@ -239,8 +238,7 @@ class DisplayBuffer extends Model
     (@getMaxLineLength() * @getDefaultCharWidth()) + @getCursorWidth()
 
   getVisibleRowRange: ->
-    unless @getLineHeightInPixels() > 0
-      throw new Error("You must assign a non-zero lineHeightInPixels before calling ::getVisibleRowRange()")
+    return [0, 0] unless @getLineHeightInPixels() > 0
 
     heightInLines = Math.ceil(@getHeight() / @getLineHeightInPixels()) + 1
     startRow = Math.floor(@getScrollTop() / @getLineHeightInPixels())
diff --git a/src/editor-component.coffee b/src/editor-component.coffee
index b46a1dc5e..f682b878f 100644
--- a/src/editor-component.coffee
+++ b/src/editor-component.coffee
@@ -37,6 +37,7 @@ EditorComponent = React.createClass
   overflowChangedEventsPaused: false
   overflowChangedWhilePaused: false
   measureLineHeightAndDefaultCharWidthWhenShown: false
+  inputEnabled: true
 
   render: ->
     {focused, fontSize, lineHeight, fontFamily, showIndentGuide, showInvisibles, visible} = @state
@@ -165,7 +166,9 @@ EditorComponent = React.createClass
     window.removeEventListener('resize', @onWindowResize)
 
   componentWillUpdate: ->
-    @props.parentView.trigger 'cursor:moved' if @cursorsMoved
+    if @props.editor.isAlive()
+      @props.parentView.trigger 'cursor:moved' if @cursorsMoved
+      @props.parentView.trigger 'selection:changed' if @selectionChanged
 
   componentDidUpdate: (prevProps, prevState) ->
     @pendingChanges.length = 0
@@ -457,6 +460,8 @@ EditorComponent = React.createClass
     scrollViewNode.scrollLeft = 0
 
   onInput: (char, replaceLastCharacter) ->
+    return unless @inputEnabled
+
     {editor} = @props
 
     if replaceLastCharacter
@@ -531,6 +536,7 @@ EditorComponent = React.createClass
 
   onCursorsMoved: ->
     @cursorsMoved = true
+    @requestUpdate()
 
   onDecorationChanged: ->
     @decorationChangedImmediate ?= setImmediate =>
@@ -707,50 +713,21 @@ EditorComponent = React.createClass
   show: ->
     @setState(visible: true)
 
-  runScrollBenchmark: ->
-    unless process.env.NODE_ENV is 'production'
-      ReactPerf = require 'react-atom-fork/lib/ReactDefaultPerf'
-      ReactPerf.start()
-
-    node = @getDOMNode()
-
-    scroll = (delta, done) ->
-      dispatchMouseWheelEvent = ->
-        node.dispatchEvent(new WheelEvent('mousewheel', wheelDeltaX: -0, wheelDeltaY: -delta))
-
-      stopScrolling = ->
-        clearInterval(interval)
-        done?()
-
-      interval = setInterval(dispatchMouseWheelEvent, 10)
-      setTimeout(stopScrolling, 500)
-
-    console.timeline('scroll')
-    scroll 50, ->
-      scroll 100, ->
-        scroll 200, ->
-          scroll 400, ->
-            scroll 800, ->
-              scroll 1600, ->
-                console.timelineEnd('scroll')
-                unless process.env.NODE_ENV is 'production'
-                  ReactPerf.stop()
-                  console.log "Inclusive"
-                  ReactPerf.printInclusive()
-                  console.log "Exclusive"
-                  ReactPerf.printExclusive()
-                  console.log "Wasted"
-                  ReactPerf.printWasted()
+  getFontSize: ->
+    @state.fontSize
 
   setFontSize: (fontSize) ->
     @setState({fontSize})
 
-  setLineHeight: (lineHeight) ->
-    @setState({lineHeight})
+  getFontFamily: ->
+    @state.fontFamily
 
   setFontFamily: (fontFamily) ->
     @setState({fontFamily})
 
+  setLineHeight: (lineHeight) ->
+    @setState({lineHeight})
+
   setShowIndentGuide: (showIndentGuide) ->
     @setState({showIndentGuide})
 
@@ -786,6 +763,48 @@ EditorComponent = React.createClass
     left = clientX - scrollViewClientRect.left + editor.getScrollLeft()
     {top, left}
 
+  getModel: ->
+    @props.editor
+
+  isInputEnabled: -> @inputEnabled
+
+  setInputEnabled: (@inputEnabled) -> @inputEnabled
+
   updateParentViewFocusedClassIfNeeded: (prevState) ->
     if prevState.focused isnt @state.focused
       @props.parentView.toggleClass('is-focused', @props.focused)
+
+  runScrollBenchmark: ->
+    unless process.env.NODE_ENV is 'production'
+      ReactPerf = require 'react-atom-fork/lib/ReactDefaultPerf'
+      ReactPerf.start()
+
+    node = @getDOMNode()
+
+    scroll = (delta, done) ->
+      dispatchMouseWheelEvent = ->
+        node.dispatchEvent(new WheelEvent('mousewheel', wheelDeltaX: -0, wheelDeltaY: -delta))
+
+      stopScrolling = ->
+        clearInterval(interval)
+        done?()
+
+      interval = setInterval(dispatchMouseWheelEvent, 10)
+      setTimeout(stopScrolling, 500)
+
+    console.timeline('scroll')
+    scroll 50, ->
+      scroll 100, ->
+        scroll 200, ->
+          scroll 400, ->
+            scroll 800, ->
+              scroll 1600, ->
+                console.timelineEnd('scroll')
+                unless process.env.NODE_ENV is 'production'
+                  ReactPerf.stop()
+                  console.log "Inclusive"
+                  ReactPerf.printInclusive()
+                  console.log "Exclusive"
+                  ReactPerf.printExclusive()
+                  console.log "Wasted"
+                  ReactPerf.printWasted()
diff --git a/src/editor-view.coffee b/src/editor-view.coffee
index 564a439ba..f4a5b0fb7 100644
--- a/src/editor-view.coffee
+++ b/src/editor-view.coffee
@@ -282,7 +282,7 @@ class EditorView extends View
     @editor.moveCursorUp(@getPageRows())
     @scrollTop(newScrollTop,  adjustVerticalScrollbar: true)
 
-  # Public: Gets the number of actual page rows existing in an editor.
+  # Gets the number of actual page rows existing in an editor.
   #
   # Returns a {Number}.
   getPageRows: ->
diff --git a/src/gutter-component.coffee b/src/gutter-component.coffee
index a4c249b58..c668f0b49 100644
--- a/src/gutter-component.coffee
+++ b/src/gutter-component.coffee
@@ -62,7 +62,7 @@ GutterComponent = React.createClass
   # since the real line numbers are absolutely positioned for performance reasons.
   appendDummyLineNumber: ->
     {maxLineNumberDigits} = @props
-    WrapperDiv.innerHTML = @buildLineNumberHTML(0, false, maxLineNumberDigits)
+    WrapperDiv.innerHTML = @buildLineNumberHTML(-1, false, maxLineNumberDigits)
     @dummyLineNumberNode = WrapperDiv.children[0]
     @refs.lineNumbers.getDOMNode().appendChild(@dummyLineNumberNode)
 
@@ -140,7 +140,7 @@ GutterComponent = React.createClass
     if decorations?
       for decoration in decorations
         classes += decoration.class + ' ' if not softWrapped or softWrapped and decoration.softWrap
-    classes += 'line-number'
+    classes += "line-number line-number-#{bufferRow}"
 
     "<div class=\"#{classes}\" style=\"#{style}\" data-buffer-row=\"#{bufferRow}\" data-screen-row=\"#{screenRow}\">#{innerHTML}</div>"
 
diff --git a/src/pane.coffee b/src/pane.coffee
index e0c579257..f09bcc90f 100644
--- a/src/pane.coffee
+++ b/src/pane.coffee
@@ -212,7 +212,10 @@ class Pane extends Model
     @destroyItem(item) for item in @getItems() when item isnt @activeItem
 
   destroy: ->
-    super unless @container?.isAlive() and @container?.getPanes().length is 1
+    if @container?.isAlive() and @container.getPanes().length is 1
+      @destroyItems()
+    else
+      super
 
   # Called by model superclass.
   destroyed: ->
@@ -331,7 +334,7 @@ class Pane extends Model
     if @parent.orientation isnt orientation
       @parent.replaceChild(this, new PaneAxis({@container, orientation, children: [this]}))
 
-    newPane = new @constructor(extend({focused: true}, params))
+    newPane = new @constructor(params)
     switch side
       when 'before' then @parent.insertChildBefore(this, newPane)
       when 'after' then @parent.insertChildAfter(this, newPane)
diff --git a/src/react-editor-view.coffee b/src/react-editor-view.coffee
index 5bb530c44..69765190a 100644
--- a/src/react-editor-view.coffee
+++ b/src/react-editor-view.coffee
@@ -23,6 +23,41 @@ class ReactEditorView extends View
   Object.defineProperty @::, 'charWidth', get: -> @editor.getDefaultCharWidth()
   Object.defineProperty @::, 'firstRenderedScreenRow', get: -> @component.getRenderedRowRange()[0]
   Object.defineProperty @::, 'lastRenderedScreenRow', get: -> @component.getRenderedRowRange()[1]
+  Object.defineProperty @::, 'active', get: -> @is(@getPane().activeView)
+  Object.defineProperty @::, 'isFocused', get: -> @component?.state.focused
+
+  afterAttach: (onDom) ->
+    return unless onDom
+    return if @attached
+
+    @attached = true
+    props = defaults({@editor, parentView: this}, @props)
+    @component = React.renderComponent(EditorComponent(props), @element)
+
+    node = @component.getDOMNode()
+
+    @scrollView = $(node).find('.scroll-view')
+    @underlayer = $(node).find('.selections').addClass('underlayer')
+    @overlayer = $(node).find('.lines').addClass('overlayer')
+    @hiddenInput = $(node).find('.hidden-input')
+
+    @gutter = $(node).find('.gutter')
+    @gutter.removeClassFromAllLines = (klass) =>
+      Grim.deprecate 'You no longer need to manually add and remove classes. Use `Editor::removeDecorationFromBufferRow()` and related functions'
+      @gutter.find('.line-number').removeClass(klass)
+
+    @gutter.getLineNumberElement = (bufferRow) =>
+      @gutter.find("[data-buffer-row='#{bufferRow}']")
+
+    @gutter.addClassToLine = (bufferRow, klass) =>
+      Grim.deprecate 'You no longer need to manually add and remove classes. Use `Editor::addDecorationToBufferRow()` and related functions'
+      lines = @gutter.find("[data-buffer-row='#{bufferRow}']")
+      lines.addClass(klass)
+      lines.length > 0
+
+    @focus() if @focusOnAttach
+
+    @trigger 'editor:attached', [this]
 
   scrollTop: (scrollTop) ->
     if scrollTop?
@@ -36,36 +71,21 @@ class ReactEditorView extends View
     else
       @editor.getScrollLeft()
 
+  scrollToBottom: ->
+    @editor.setScrollBottom(Infinity)
+
   scrollToScreenPosition: (screenPosition) ->
     @editor.scrollToScreenPosition(screenPosition)
 
   scrollToBufferPosition: (bufferPosition) ->
     @editor.scrollToBufferPosition(bufferPosition)
 
-  afterAttach: (onDom) ->
-    return unless onDom
-    @attached = true
-    props = defaults({@editor, parentView: this}, @props)
-    @component = React.renderComponent(EditorComponent(props), @element)
+  scrollToCursorPosition: ->
+    @editor.scrollToCursorPosition()
 
-    node = @component.getDOMNode()
-
-    @underlayer = $(node).find('.selections')
-
-    @gutter = $(node).find('.gutter')
-    @gutter.removeClassFromAllLines = (klass) =>
-      Grim.deprecate 'You no longer need to manually add and remove classes. Use `Editor::removeDecorationFromBufferRow()` and related functions'
-      @gutter.find('.line-number').removeClass(klass)
-
-    @gutter.addClassToLine = (bufferRow, klass) =>
-      Grim.deprecate 'You no longer need to manually add and remove classes. Use `Editor::addDecorationToBufferRow()` and related functions'
-      lines = @gutter.find("[data-buffer-row='#{bufferRow}']")
-      lines.addClass(klass)
-      lines.length > 0
-
-    @focus() if @focusOnAttach
-
-    @trigger 'editor:attached', [this]
+  scrollToPixelPosition: (pixelPosition) ->
+    screenPosition = screenPositionForPixelPosition(pixelPosition)
+    @editor.scrollToScreenPosition(screenPosition)
 
   pixelPositionForBufferPosition: (bufferPosition) ->
     @editor.pixelPositionForBufferPosition(bufferPosition)
@@ -83,6 +103,26 @@ class ReactEditorView extends View
     @attached = false
     @trigger 'editor:detached', this
 
+  # Public: Split the editor view left.
+  splitLeft: ->
+    pane = @getPane()
+    pane?.splitLeft(pane?.copyActiveItem()).activeView
+
+  # Public: Split the editor view right.
+  splitRight: ->
+    pane = @getPane()
+    pane?.splitRight(pane?.copyActiveItem()).activeView
+
+  # Public: Split the editor view up.
+  splitUp: ->
+    pane = @getPane()
+    pane?.splitUp(pane?.copyActiveItem()).activeView
+
+  # Public: Split the editor view down.
+  splitDown: ->
+    pane = @getPane()
+    pane?.splitDown(pane?.copyActiveItem()).activeView
+
   getPane: ->
     @closest('.pane').view()
 
@@ -94,10 +134,77 @@ class ReactEditorView extends View
 
   hide: ->
     super
-    @component.hide()
+    @component?.hide()
 
   show: ->
     super
-    @component.show()
+    @component?.show()
+
+  pageDown: ->
+    @editor.pageDown()
+
+  pageUp: ->
+    @editor.pageUp()
+
+  getModel: ->
+    @component?.getModel()
+
+  getFirstVisibleScreenRow: ->
+    @editor.getVisibleRowRange()[0]
+
+  getLastVisibleScreenRow: ->
+    @editor.getVisibleRowRange()[1]
+
+  getFontFamily: ->
+    @component?.getFontFamily()
+
+  setFontFamily: (fontFamily)->
+    @component?.setFontFamily(fontFamily)
+
+  getFontSize: ->
+    @component?.getFontSize()
+
+  setFontSize: (fontSize)->
+    @component?.setFontSize(fontSize)
+
+  setWidthInChars: (widthInChars) ->
+    @component.getDOMNode().style.width = (@editor.getDefaultCharWidth() * widthInChars) + 'px'
+
+  setLineHeight: (lineHeight) ->
+    @component.setLineHeight(lineHeight)
+
+  setShowIndentGuide: (showIndentGuide) ->
+    @component.setShowIndentGuide(showIndentGuide)
+
+  setSoftWrap: (softWrap) ->
+    @editor.setSoftWrap(softWrap)
+
+  setShowInvisibles: (showInvisibles) ->
+    @component.setShowInvisibles(showInvisibles)
+
+  toggleSoftWrap: ->
+    @editor.toggleSoftWrap()
+
+  toggleSoftTabs: ->
+    @editor.toggleSoftTabs()
+
+  getText: ->
+    @editor.getText()
+
+  setText: (text) ->
+    @editor.setText(text)
+
+  insertText: (text) ->
+    @editor.insertText(text)
+
+  isInputEnabled: ->
+    @component.isInputEnabled()
+
+  setInputEnabled: (inputEnabled) ->
+    @component.setInputEnabled(inputEnabled)
 
   requestDisplayUpdate: -> # No-op shim for find-and-replace
+
+  updateDisplay: -> # No-op shim for package specs
+
+  redraw: -> # No-op shim