From cf958ffeac6ac01345a8ab6855688aacfb62b2ec Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Wed, 11 Feb 2015 22:34:42 -0700
Subject: [PATCH] =?UTF-8?q?Don=E2=80=99t=20cascade=20computed=20values=20u?=
 =?UTF-8?q?nless=20upstream=20values=20change?=
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---
 src/text-editor-presenter.coffee | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/text-editor-presenter.coffee b/src/text-editor-presenter.coffee
index c426631a9..c96668445 100644
--- a/src/text-editor-presenter.coffee
+++ b/src/text-editor-presenter.coffee
@@ -361,14 +361,18 @@ class TextEditorPresenter
     Math.max(contentHeight, @height)
 
   updateContentWidth: ->
-    @contentWidth = @pixelPositionForScreenPosition([@model.getLongestScreenRow(), Infinity]).left
-    @contentWidth += 1 unless @model.isSoftWrapped() # account for cursor width
-    @updateScrollbarDimensions()
+    contentWidth = @pixelPositionForScreenPosition([@model.getLongestScreenRow(), Infinity]).left
+    contentWidth += 1 unless @model.isSoftWrapped() # account for cursor width
+    unless @contentWidth is contentWidth
+      @contentWidth = contentWidth
+      @updateScrollbarDimensions()
 
   updateContentHeight: ->
-    @contentHeight = @lineHeight * @model.getScreenLineCount()
-    @updateHeight()
-    @updateScrollbarDimensions()
+    contentHeight = @lineHeight * @model.getScreenLineCount()
+    unless @contentHeight is contentHeight
+      @contentHeight = contentHeight
+      @updateHeight()
+      @updateScrollbarDimensions()
 
   computeClientHeight: ->
     @height - @horizontalScrollbarHeight
@@ -528,8 +532,10 @@ class TextEditorPresenter
       @updateLineNumbersState()
 
   updateHeight: ->
-    @height = @explicitHeight ? @contentHeight
-    @updateScrollbarDimensions()
+    height = @explicitHeight ? @contentHeight
+    unless @height is height
+      @height = height
+      @updateScrollbarDimensions()
 
   setContentFrameWidth: (contentFrameWidth) ->
     unless @contentFrameWidth is contentFrameWidth