From 4b6f09cd10da9ebe2de4a4e5ab617f3a87678128 Mon Sep 17 00:00:00 2001
From: Antonio Scandurra <as-cii@github.com>
Date: Mon, 8 Aug 2016 18:41:20 +0200
Subject: [PATCH] Assert that all buffer events are processed sequentially

Signed-off-by: Nathan Sobo <nathan@github.com>
---
 src/tokenized-buffer.coffee | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/tokenized-buffer.coffee b/src/tokenized-buffer.coffee
index 3bbef3c4d..a79e37493 100644
--- a/src/tokenized-buffer.coffee
+++ b/src/tokenized-buffer.coffee
@@ -242,6 +242,16 @@ class TokenizedBuffer extends Model
         row + delta
 
   handleBufferChange: (e) ->
+    if @lastBufferChangeEventId?
+      @assert(
+        @lastBufferChangeEventId is e.eventId - 1,
+        'Buffer Change Event Ids are not sequential',
+        (error) =>
+          error.metadata = {
+            tokenizedBufferEventId: @lastBufferChangeEventId,
+            nextTokenizedBufferEventId: e.eventId,
+          }
+      )
     @lastBufferChangeEventId = e.eventId
     @changeCount = @buffer.changeCount