Don't move down a line if it's the last buffer row

spec/text-editor-spec.coffee

@@ -2875,6 +2875,13 @@ describe "TextEditor", ->
             expect(editor.lineTextForBufferRow(1)).toBe "1"
             expect(editor.lineTextForBufferRow(2)).toBe "2"
 
+      describe "when the line is the last buffer row", ->
+        it "doesn't move it", ->
+          editor.setText("abc\ndef")
+          editor.setCursorBufferPosition([1, 0])
+          editor.moveLineDown()
+          expect(editor.getText()).toBe("abc\ndef")
+
     describe ".insertText(text)", ->
       describe "when there is a single selection", ->
         beforeEach ->

src/text-editor.coffee

@@ -1068,7 +1068,7 @@ class TextEditor extends Model
 
         # Delete lines spanned by selection and insert them on the following correct buffer row
         lines = @buffer.getTextInRange(linesRange)
-        if linesRange.end.row is @buffer.getLastRow()
+        if followingRow - 1 is @buffer.getLastRow()
           lines = "\n#{lines}"
 
         @buffer.insert([followingRow, 0], lines)