From a6efa104dbef90a0b199ff77200de24d1c919fbd Mon Sep 17 00:00:00 2001
From: Jess Lin <jessicalin@fb.com>
Date: Mon, 30 Mar 2015 14:49:35 -0700
Subject: [PATCH] [Gutter] Don't allow the 'line-number' gutter to be destroyed

---
 spec/gutter-spec.coffee | 4 ++++
 src/gutter.coffee       | 9 ++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/spec/gutter-spec.coffee b/spec/gutter-spec.coffee
index 80b919423..ba6933a05 100644
--- a/spec/gutter-spec.coffee
+++ b/spec/gutter-spec.coffee
@@ -62,3 +62,7 @@ describe 'Gutter', ->
         didDestroy = true
       gutter.destroy()
       expect(didDestroy).toBe true
+
+    it 'does not allow destroying the line-number gutter', ->
+      gutter = new Gutter mockGutterContainer, {name: 'line-number'}
+      expect(gutter.destroy).toThrow()
diff --git a/src/gutter.coffee b/src/gutter.coffee
index bd50b4157..9e002674b 100644
--- a/src/gutter.coffee
+++ b/src/gutter.coffee
@@ -23,9 +23,12 @@ class Gutter
     @emitter = new Emitter
 
   destroy: ->
-    @gutterContainer.removeGutter(this)
-    @emitter.emit 'did-destroy'
-    @emitter.dispose()
+    if @name is 'line-number'
+      throw new Error('The line-number gutter cannot be destroyed.')
+    else
+      @gutterContainer.removeGutter(this)
+      @emitter.emit 'did-destroy'
+      @emitter.dispose()
 
   hide: ->
     if @visible