SoftWrap state is stored in EditSessions, but it is set and toggled via Editor.

spec/app/edit-session-spec.coffee

@@ -10,7 +10,7 @@ describe "EditSession", ->
       buffer: buffer
       tabText: '  '
       autoIndent: false
-      softWrapColumn: Infinity
+      softWrap: false
 
     lineLengths = buffer.getLines().map (line) -> line.length
 

src/app/edit-session.coffee

@@ -24,11 +24,12 @@ class EditSession
   selections: null
   autoIndent: true
   softTabs: true
+  softWrap: false
 
-  constructor: ({@buffer, @tabText, @autoIndent, @softTabs, @softWrapColumn}) ->
+  constructor: ({@buffer, @tabText, @autoIndent, @softTabs, @softWrap}) ->
     @id = @constructor.idCounter++
     @softTabs ?= true
-    @displayBuffer = new DisplayBuffer(@buffer, { @softWrapColumn, @tabText })
+    @displayBuffer = new DisplayBuffer(@buffer, { @tabText })
     @tokenizedBuffer = @displayBuffer.tokenizedBuffer
     @cursors = []
     @selections = []
@@ -70,6 +71,9 @@ class EditSession
   setAutoIndent: (@autoIndent) ->
   setSoftTabs: (@softTabs) ->
 
+  getSoftWrap: -> @softWrap
+  setSoftWrap: (@softWrap) ->
+
   clipBufferPosition: (bufferPosition, options) ->
     { row, column } = Point.fromObject(bufferPosition)
     row = 0 if row < 0

src/app/editor.coffee

@@ -33,7 +33,6 @@ class Editor extends View
 
   vScrollMargin: 2
   hScrollMargin: 10
-  softWrap: false
   lineHeight: null
   charWidth: null
   charHeight: null
@@ -74,7 +73,7 @@ class Editor extends View
     else if @mini
       editSession = new EditSession
         buffer: new Buffer()
-        softWrapColumn: null
+        softWrap: false
         tabText: "  "
         autoIndent: false
         softTabs: true
@@ -337,7 +336,7 @@ class Editor extends View
     @subscribeToFontSize()
     @calculateDimensions()
     @hiddenInput.width(@charWidth)
-    @setSoftWrapColumn() if @softWrap
+    @setSoftWrapColumn() if @activeEditSession.getSoftWrap()
     $(window).on "resize.editor#{@id}", => @updateRenderedLines()
     @focus() if @isFocused
 
@@ -436,7 +435,7 @@ class Editor extends View
       @scrollTop(desiredTop)
 
   scrollHorizontally: (pixelPosition) ->
-    return if @softWrap
+    return if @activeEditSession.getSoftWrap()
 
     charsInView = @scrollView.width() / @charWidth
     maxScrollMargin = Math.floor((charsInView - 1) / 2)
@@ -471,17 +470,18 @@ class Editor extends View
     @activeEditSession.setScrollLeft(@scrollView.scrollLeft())
 
   toggleSoftWrap: ->
-    @setSoftWrap(not @softWrap)
+    @setSoftWrap(not @activeEditSession.getSoftWrap())
 
   calcSoftWrapColumn: ->
-    if @softWrap
+    if @activeEditSession.getSoftWrap()
       Math.floor(@scrollView.width() / @charWidth)
     else
       Infinity
 
-  setSoftWrap: (@softWrap, softWrapColumn=undefined) ->
+  setSoftWrap: (softWrap, softWrapColumn=undefined) ->
+    @activeEditSession.setSoftWrap(softWrap)
     @setSoftWrapColumn(softWrapColumn) if @attached
-    if @softWrap
+    if @activeEditSession.getSoftWrap()
       @addClass 'soft-wrap'
       @_setSoftWrapColumn = => @setSoftWrapColumn()
       $(window).on 'resize', @_setSoftWrapColumn

src/app/project.coffee

@@ -14,12 +14,11 @@ class Project
   tabText: null
   autoIndent: null
   softTabs: null
-  softWrapColumn: null
+  softWrap: null
 
   constructor: (path) ->
     @setPath(path)
     @editSessions = []
-
     @setTabText('  ')
     @setAutoIndent(true)
     @setSoftTabs(true)
@@ -73,8 +72,8 @@ class Project
   getSoftTabs: -> @softTabs
   setSoftTabs: (@softTabs) ->
 
-  getSoftWrapColumn: -> @softWrapColumn
-  setSoftWrapColumn: (@softWrapColumn) ->
+  getSoftWrap: -> @softWrap
+  setSoftWrap: (@softWrap) ->
 
   open: (filePath) ->
     if filePath?
@@ -88,7 +87,7 @@ class Project
       tabText: @getTabText()
       autoIndent: @getAutoIndent()
       softTabs: @getSoftTabs()
-      softWrapColumn: @getSoftWrapColumn()
+      softWrap: @getSoftWrap()
 
     @editSessions.push editSession
     editSession