Fix bug where destroying a fold on last screen line of wrapped line caused an artifact.

spec/atom/editor-spec.coffee

@@ -161,6 +161,15 @@ describe "Editor", ->
         editor.createFold([[3, 10], [5, 1]])
         expect(editor.gutter.find('.line-number:eq(3)').text()).toBe '4'
         expect(editor.gutter.find('.line-number:eq(4)').text()).toBe '7'
+
+    describe "when there is a fold on the last screen line of a wrapped line", ->
+      it "renders line numbers correctly when the fold is destroyed (regression)", ->
+        editor.setMaxLineLength(50)
+        fold = editor.createFold([[3, 52], [3, 56]])
+        fold.destroy()
+        # console.log editor.renderer.bufferRowsForScreenRows()
+        expect(editor.gutter.find('.line-number:last').text()).toBe '13'
+
     it "adds a drop shadow when the horizontal scroller is scrolled to the right", ->
       editor.attachToDom()
       editor.width(100)

spec/atom/renderer-spec.coffee

@@ -57,6 +57,10 @@ describe "Renderer", ->
           changeHandler.reset()
           fold.destroy()
 
+          expect(renderer.lineForRow(3).text).toBe '    var pivot = items.shift(), current, left = [], '
+          expect(renderer.lineForRow(4).text).toBe 'right = [];'
+          expect(renderer.lineForRow(5).text).toBe '    while(items.length > 0) {'
+
           expect(changeHandler).toHaveBeenCalled()
           [[event]]= changeHandler.argsForCall
           expect(event.oldRange).toEqual([[3, 0], [4, 10]])

src/atom/line-map.coffee

@@ -19,9 +19,6 @@ class LineMap
   replaceBufferRows: (start, end, lineFragments) ->
     @spliceAtBufferRow(start, end - start + 1, lineFragments)
 
-  replaceScreenRow: (row, lineFragments) ->
-    @replaceScreenRows(row, row, lineFragments)
-
   replaceScreenRows: (start, end, lineFragments) ->
     @spliceAtScreenRow(start, end - start + 1, lineFragments)
 

src/atom/renderer.coffee

@@ -75,8 +75,11 @@ class Renderer
     startScreenRow = @screenRowForBufferRow(bufferRange.start.row)
 
     oldScreenRange = @screenLineRangeForBufferRange(bufferRange)
-    @lineMap.replaceScreenRow(startScreenRow,
-      @buildLinesForBufferRows(bufferRange.start.row, bufferRange.end.row))
+    lines = @buildLinesForBufferRows(bufferRange.start.row, bufferRange.end.row)
+    @lineMap.replaceScreenRows(
+      oldScreenRange.start.row,
+      oldScreenRange.end.row
+      lines)
     newScreenRange = @screenLineRangeForBufferRange(bufferRange)
 
     @trigger 'change', oldRange: oldScreenRange, newRange: newScreenRange