Use buffer instead of line map for EditSession.clipBufferPosition(position)

spec/app/edit-session-spec.coffee

@@ -1234,3 +1234,9 @@ describe "EditSession", ->
           editSession.foldAll()
           expect(editSession.getCursorBufferPosition()).toEqual([5,5])
 
+
+  describe ".clipBufferPosition(bufferPosition)", ->
+    it "clips the given position to a valid position", ->
+      expect(editSession.clipBufferPosition([-1, -1])).toEqual [0,0]
+      expect(editSession.clipBufferPosition([Infinity, Infinity])).toEqual [12,2]
+      expect(editSession.clipBufferPosition([8, 57])).toEqual [8, 56]

src/app/edit-session.coffee

@@ -87,7 +87,13 @@ class EditSession
     @renderer.clipScreenPosition(screenPosition, options)
 
   clipBufferPosition: (bufferPosition, options) ->
-    @renderer.clipBufferPosition(bufferPosition, options)
+    { row, column } = Point.fromObject(bufferPosition)
+    row = 0 if row < 0
+    column = 0 if column < 0
+    row = Math.min(@buffer.getLastRow(), row)
+    column = Math.min(@buffer.lineLengthForRow(row), column)
+
+    new Point(row, column)
 
   getEofBufferPosition: ->
     @buffer.getEofPosition()

src/app/line-map.coffee

@@ -81,9 +81,6 @@ class LineMap
   clipScreenPosition: (screenPosition, options) ->
     @clipPosition('screenDelta', screenPosition, options)
 
-  clipBufferPosition: (bufferPosition, options) ->
-    @clipPosition('bufferDelta', bufferPosition, options)
-
   clipPosition: (deltaType, position, options={}) ->
     options.clipToBounds = true
     @translatePosition(deltaType, deltaType, position, options)

src/app/renderer.coffee

@@ -165,9 +165,6 @@ class Renderer
   clipScreenPosition: (position, options) ->
     @lineMap.clipScreenPosition(position, options)
 
-  clipBufferPosition: (position, options) ->
-    @lineMap.clipBufferPosition(position, options)
-
   handleBufferChange: (e) ->
     allFolds = [] # Folds can modify @activeFolds, so first make sure we have a stable array of folds
     allFolds.push(folds...) for row, folds of @activeFolds