Remove event listeners from orphaned gutters

src/gutter-container-component.coffee

@@ -16,7 +16,12 @@ class GutterContainerComponent
 
     @domNode = document.createElement('div')
     @domNode.classList.add('gutter-container')
-    @domNode.style.display = 'flex';
+    @domNode.style.display = 'flex'
+
+  destroy: ->
+    for {name, component} in @gutterComponents
+      component.destroy?()
+    return
 
   getDomNode: ->
     @domNode

src/line-number-gutter-component.coffee

@@ -18,6 +18,10 @@ class LineNumberGutterComponent
     @domNode.addEventListener 'click', @onClick
     @domNode.addEventListener 'mousedown', @onMouseDown
 
+  destroy: ->
+    @domNode.removeEventListener 'click', @onClick
+    @domNode.removeEventListener 'mousedown', @onMouseDown
+
   getDomNode: ->
     @domNode
 

src/text-editor-component.coffee

@@ -106,6 +106,7 @@ class TextEditorComponent
     @mounted = false
     @disposables.dispose()
     @presenter.destroy()
+    @gutterContainerComponent?.destroy()
     window.removeEventListener 'resize', @requestHeightAndWidthMeasurement
 
   getDomNode: ->