Renderer can place a fold placeholder directly before a soft-wrap

spec/atom/renderer-spec.coffee

@@ -1,7 +1,7 @@
 Renderer = require 'renderer'
 Buffer = require 'buffer'
 
-fdescribe "Renderer", ->
+describe "Renderer", ->
   [renderer, buffer, changeHandler] = []
   beforeEach ->
     buffer = new Buffer(require.resolve 'fixtures/sample.js')
@@ -55,6 +55,12 @@ fdescribe "Renderer", ->
           expect(renderer.lineForRow(7).text).toBe 'ht));'
           expect(renderer.lineForRow(8).text).toBe '  };'
 
+      describe "when there is a fold placeholder ending at the max length boundary", ->
+        it "wraps the line after the fold placeholder", ->
+          renderer.createFold([[3, 47], [3, 51]])
+          expect(renderer.lineForRow(3).text).toBe '    var pivot = items.shift(), current, left = ...'
+          expect(renderer.lineForRow(4).text).toBe 'right = [];'
+
     describe "when the buffer changes", ->
       describe "when buffer lines are updated", ->
         describe "when the update makes a soft-wrapped line shorter than the max line length", ->
@@ -397,7 +403,7 @@ fdescribe "Renderer", ->
           expect(event.oldRange).toEqual [[4, 0], [4, 56]]
           expect(event.newRange).toEqual [[4, 0], [4, 60]]
 
-    fdescribe "position translation", ->
+    describe "position translation", ->
       describe "when there is single fold spanning multiple lines", ->
         it "translates positions to account for folded lines and characters and the placeholder", ->
           renderer.createFold([[4, 29], [7, 4]])

spec/atom/screen-line-fragment-spec.coffee

@@ -45,8 +45,12 @@ describe "screenLineFragment", ->
       expect(right2.outputDelta).toEqual [0, 10]
 
     describe "if splitting at 0", ->
-      it "returns undefined for the left half", ->
-        expect(screenLine.splitAt(0)).toEqual [undefined, screenLine]
+      it "returns an empty line fragment for the left half", ->
+        left = screenLine.splitAt(0)[0]
+        expect(left.text).toBe ''
+        expect(left.tokens).toEqual []
+        expect(left.inputDelta).toEqual [0, 0]
+        expect(left.outputDelta).toEqual [0, 0]
 
     describe "if splitting at a column equal to the line length", ->
       it "returns an empty line fragment that spans a row for the right half", ->

src/atom/screen-line-fragment.coffee

@@ -11,7 +11,7 @@ class ScreenLineFragment
     _.extend(this, extraFields)
 
   splitAt: (column) ->
-    return [undefined, this] if column == 0
+    return [new ScreenLineFragment([], '', [0, 0], [0, 0]), this] if column == 0
 
     rightTokens = _.clone(@tokens)
     leftTokens = []