diff --git a/apm/package.json b/apm/package.json
index e491d584e..f735cb6f4 100644
--- a/apm/package.json
+++ b/apm/package.json
@@ -6,6 +6,6 @@
     "url": "https://github.com/atom/atom.git"
   },
   "dependencies": {
-    "atom-package-manager": "0.140.0"
+    "atom-package-manager": "0.141.0"
   }
 }
diff --git a/docs/build-instructions/linux.md b/docs/build-instructions/linux.md
index 83815dd4a..7b95e8a17 100644
--- a/docs/build-instructions/linux.md
+++ b/docs/build-instructions/linux.md
@@ -18,7 +18,7 @@ Ubuntu LTS 12.04 64-bit is the recommended platform.
 
 * `sudo apt-get install build-essential git libgnome-keyring-dev fakeroot`
 * Instructions for  [Node.js](https://github.com/joyent/node/wiki/Installing-Node.js-via-package-manager#ubuntu-mint-elementary-os).
-  * Make sure the command `node` is available after Node.js installation (some sytems install it as `nodejs`).
+  * Make sure the command `node` is available after Node.js installation (some systems install it as `nodejs`).
   * Use `which node` to check if it is available.
   * Use `sudo update-alternatives --install /usr/bin/node node /usr/bin/nodejs 10` to update it.
 
@@ -74,7 +74,7 @@ If you have problems with permissions don't forget to prefix with `sudo`
 
   To use the newly installed Atom, quit and restart all running Atom instances.
 
-5. *Optionally*, you may generate distributable packages of Atom at `$TMPDIR/atom-build`. Currenty, `.deb` and `.rpm` package types are supported. To create a `.deb` package run:
+5. *Optionally*, you may generate distributable packages of Atom at `$TMPDIR/atom-build`. Currently, `.deb` and `.rpm` package types are supported. To create a `.deb` package run:
 
   ```sh
   script/grunt mkdeb
@@ -123,7 +123,7 @@ and restart Atom.  If Atom now works fine, you can make this setting permanent:
   echo 32768 | sudo tee -a /proc/sys/fs/inotify/max_user_watches
   ```
 
-See also https://github.com/atom/atom/issues/2082.
+See also [#2082](https://github.com/atom/atom/issues/2082).
 
 ### /usr/bin/env: node: No such file or directory
 
diff --git a/docs/upgrading/upgrading-your-ui-theme.md b/docs/upgrading/upgrading-your-ui-theme.md
index 822b0759a..5be0344bb 100644
--- a/docs/upgrading/upgrading-your-ui-theme.md
+++ b/docs/upgrading/upgrading-your-ui-theme.md
@@ -19,7 +19,7 @@ Old Selector        | New Selector
 `.workspace`        | `atom-workspace`
 `.horizontal`       | `atom-workspace-axis.horizontal`
 `.vertical`         | `atom-workspace-axis.vertical`
-`.pane-container`   | `atom-pane-conatiner`
+`.pane-container`   | `atom-pane-container`
 `.pane`             | `atom-pane`
 `.tool-panel`       | `atom-panel`
 `.panel-top`        | `atom-panel.top`
diff --git a/docs/your-first-package.md b/docs/your-first-package.md
index eb882abc7..42aca7c31 100644
--- a/docs/your-first-package.md
+++ b/docs/your-first-package.md
@@ -72,7 +72,7 @@ command palette or by pressing `ctrl-alt-cmd-l`.
 
 Now open the command panel and search for the `ascii-art:convert` command. But
 it's not there! To fix this, open _package.json_ and find the property called
-`activationCommands`. Activation Events speed up load time by allowing Atom to
+`activationCommands`. Activation Commands speed up Atom's load time by allowing it to
 delay a package's activation until it's needed. So remove the existing command
 and add `ascii-art:convert` to the `activationCommands` array:
 
diff --git a/package.json b/package.json
index 39629d4a1..ecbac9756 100644
--- a/package.json
+++ b/package.json
@@ -113,16 +113,16 @@
     "spell-check": "0.55.0",
     "status-bar": "0.60.0",
     "styleguide": "0.44.0",
-    "symbols-view": "0.83.0",
+    "symbols-view": "0.84.0",
     "tabs": "0.67.0",
     "timecop": "0.30.0",
-    "tree-view": "0.160.0",
+    "tree-view": "0.161.0",
     "update-package-dependencies": "0.8.0",
     "welcome": "0.24.0",
     "whitespace": "0.29.0",
     "wrap-guide": "0.31.0",
-    "language-c": "0.40.0",
-    "language-clojure": "0.12.0",
+    "language-c": "0.41.0",
+    "language-clojure": "0.13.0",
     "language-coffee-script": "0.39.0",
     "language-csharp": "0.5.0",
     "language-css": "0.28.0",
@@ -132,7 +132,7 @@
     "language-html": "0.29.0",
     "language-hyperlink": "0.12.2",
     "language-java": "0.14.0",
-    "language-javascript": "0.57.0",
+    "language-javascript": "0.58.0",
     "language-json": "0.12.0",
     "language-less": "0.24.0",
     "language-make": "0.13.0",
diff --git a/spec/git-repository-provider-spec.coffee b/spec/git-repository-provider-spec.coffee
index 7d77adc36..59e3f55af 100644
--- a/spec/git-repository-provider-spec.coffee
+++ b/spec/git-repository-provider-spec.coffee
@@ -54,3 +54,27 @@ describe "GitRepositoryProvider", ->
           directory = new Directory dirPath
           provider.repositoryForDirectory(directory).then (result) ->
             expect(result).toBe null
+
+    describe "when specified a Directory without existsSync()", ->
+      directory = null
+      provider = null
+      beforeEach ->
+        provider = new GitRepositoryProvider atom.project
+
+        # An implementation of Directory that does not implement existsSync().
+        subdirectory = {}
+        directory =
+          getSubdirectory: ->
+          isRoot: -> true
+        spyOn(directory, "getSubdirectory").andReturn(subdirectory)
+
+      it "returns null", ->
+        repo = provider.repositoryForDirectorySync(directory)
+        expect(repo).toBe null
+        expect(directory.getSubdirectory).toHaveBeenCalledWith(".git")
+
+      it "returns a Promise that resolves to null for the async implementation", ->
+        waitsForPromise ->
+          provider.repositoryForDirectory(directory).then (repo) ->
+            expect(repo).toBe null
+            expect(directory.getSubdirectory).toHaveBeenCalledWith(".git")
diff --git a/spec/text-editor-presenter-spec.coffee b/spec/text-editor-presenter-spec.coffee
index 7691b663f..163521c32 100644
--- a/spec/text-editor-presenter-spec.coffee
+++ b/spec/text-editor-presenter-spec.coffee
@@ -839,6 +839,11 @@ describe "TextEditorPresenter", ->
           expect(presenter.state.content.lines[oldLine3.id]).toBeUndefined()
           expect(presenter.state.content.lines[newLine3.id]).toBeDefined()
 
+        it "does not attempt to preserve lines corresponding to ::mouseWheelScreenRow if they have been deleted", ->
+          presenter = buildPresenter(explicitHeight: 25, scrollTop: 0, lineHeight: 10, lineOverdrawMargin: 1, stoppedScrollingDelay: 200)
+          presenter.setMouseWheelScreenRow(10)
+          editor.setText('')
+
         describe "[lineId]", -> # line state objects
           it "includes the .endOfLineInvisibles if the editor.showInvisibles config option is true", ->
             editor.setText("hello\nworld\r\n")
diff --git a/src/git-repository-provider.coffee b/src/git-repository-provider.coffee
index 210197599..850d30f22 100644
--- a/src/git-repository-provider.coffee
+++ b/src/git-repository-provider.coffee
@@ -11,7 +11,7 @@ findGitDirectorySync = (directory) ->
   # can return cached values rather than always returning new objects:
   # getParent(), getFile(), getSubdirectory().
   gitDir = directory.getSubdirectory('.git')
-  if gitDir.existsSync() and isValidGitDirectorySync gitDir
+  if gitDir.existsSync?() and isValidGitDirectorySync gitDir
     gitDir
   else if directory.isRoot()
     return null
diff --git a/src/scope-descriptor.coffee b/src/scope-descriptor.coffee
index 73e269de3..5035810d6 100644
--- a/src/scope-descriptor.coffee
+++ b/src/scope-descriptor.coffee
@@ -15,7 +15,7 @@
 #   specific position in the buffer.
 # * {Cursor::getScopeDescriptor} to get a cursor's descriptor based on position.
 #
-# See the [scopes and scope descriptor guide](https://atom.io/docs/v0.138.0/advanced/scopes-and-scope-descriptors)
+# See the [scopes and scope descriptor guide](https://atom.io/docs/latest/advanced/scopes-and-scope-descriptors)
 # for more information.
 module.exports =
 class ScopeDescriptor
diff --git a/src/text-editor-presenter.coffee b/src/text-editor-presenter.coffee
index 215398c05..b76666209 100644
--- a/src/text-editor-presenter.coffee
+++ b/src/text-editor-presenter.coffee
@@ -228,8 +228,8 @@ class TextEditorPresenter
       row++
 
     if @mouseWheelScreenRow?
-      preservedLine = @model.tokenizedLineForScreenRow(@mouseWheelScreenRow)
-      visibleLineIds[preservedLine.id] = true
+      if preservedLine = @model.tokenizedLineForScreenRow(@mouseWheelScreenRow)
+        visibleLineIds[preservedLine.id] = true
 
     for id, line of @state.content.lines
       unless visibleLineIds.hasOwnProperty(id)
diff --git a/src/text-editor-view.coffee b/src/text-editor-view.coffee
index 5db4e41ce..e75b6609b 100644
--- a/src/text-editor-view.coffee
+++ b/src/text-editor-view.coffee
@@ -1,5 +1,4 @@
 {View, $} = require 'space-pen'
-React = require 'react-atom-fork'
 {defaults} = require 'underscore-plus'
 TextBuffer = require 'text-buffer'
 TextEditor = require './text-editor'
@@ -186,9 +185,6 @@ class TextEditorView extends View
     view.css('z-index', 1)
     @overlayer.append(view)
 
-  unmountComponent: ->
-    React.unmountComponentAtNode(@element) if @component.isMounted()
-
   splitLeft: ->
     deprecate """
       Use Pane::splitLeft instead.
diff --git a/src/text-editor.coffee b/src/text-editor.coffee
index b86b97d17..bd3f76190 100644
--- a/src/text-editor.coffee
+++ b/src/text-editor.coffee
@@ -2207,18 +2207,18 @@ class TextEditor extends Model
       @suppressSelectionMerging = false
 
     reducer = (disjointSelections, selection) ->
-      intersectingSelection = _.find disjointSelections, (otherSelection) ->
-        exclusive = not selection.isEmpty() and not otherSelection.isEmpty()
-        intersects = otherSelection.intersectsWith(selection, exclusive)
-        intersects
+      adjacentSelection = _.last(disjointSelections)
+      exclusive = not selection.isEmpty() and not adjacentSelection.isEmpty()
+      intersects = adjacentSelection.intersectsWith(selection, exclusive)
 
-      if intersectingSelection?
-        intersectingSelection.merge(selection, options)
+      if intersects
+        adjacentSelection.merge(selection, options)
         disjointSelections
       else
         disjointSelections.concat([selection])
 
-    _.reduce(@getSelections(), reducer, [])
+    [head, tail...] = @getSelectionsOrderedByBufferPosition()
+    _.reduce(tail, reducer, [head])
 
   # Add a {Selection} based on the given {Marker}.
   #