Report the already calculated height to the model

src/display-buffer.coffee

@@ -200,21 +200,13 @@ class DisplayBuffer extends Model
   setVerticalScrollbarWidth: (@verticalScrollbarWidth) -> @verticalScrollbarWidth
 
   getHeight: ->
-    if @height?
-      @height
-    else
-      if @horizontallyScrollable()
-        @getScrollHeight() + @getHorizontalScrollbarHeight()
-      else
-        @getScrollHeight()
+    @height or 0
 
-  setHeight: (@height) -> @height
+  setHeight: (@height) ->
+    @height
 
   getClientHeight: (reentrant) ->
-    if @horizontallyScrollable(reentrant)
-      @getHeight() - @getHorizontalScrollbarHeight()
-    else
-      @getHeight()
+    @getHeight()
 
   getClientWidth: (reentrant) ->
     if @verticallyScrollable(reentrant)

src/text-editor-presenter.coffee

@@ -50,7 +50,7 @@ class TextEditorPresenter
     @emitter.emit "did-update-state" if @isBatching()
 
   transferMeasurementsToModel: ->
-    @model.setHeight(@explicitHeight) if @explicitHeight?
+    # @model.setHeight(@explicitHeight) if @explicitHeight?
     @model.setWidth(@contentFrameWidth) if @contentFrameWidth?
     @model.setLineHeightInPixels(@lineHeight) if @lineHeight?
     @model.setDefaultCharWidth(@baseCharacterWidth) if @baseCharacterWidth?
@@ -688,6 +688,7 @@ class TextEditorPresenter
     clientHeight = @height - @horizontalScrollbarHeight
     unless @clientHeight is clientHeight
       @clientHeight = clientHeight
+      @model.setHeight(@clientHeight)
       @updateScrollHeight()
       @updateScrollTop()
 
@@ -919,7 +920,6 @@ class TextEditorPresenter
   setExplicitHeight: (explicitHeight) ->
     unless @explicitHeight is explicitHeight
       @explicitHeight = explicitHeight
-      @model.setHeight(explicitHeight)
       @updateHeight()
       @shouldUpdateVerticalScrollState = true
       @shouldUpdateScrollbarsState = true