Fix soft wrapping when editorWidthInChars is used

spec/text-editor-presenter-spec.coffee

@@ -2132,6 +2132,12 @@ describe "TextEditorPresenter", ->
               expectValues lineNumberStateForScreenRow(presenter, 6), {screenRow: 6, bufferRow: 3, softWrapped: true}
               expectValues lineNumberStateForScreenRow(presenter, 7), {screenRow: 7, bufferRow: 4, softWrapped: false}
 
+              presenter.setContentFrameWidth(500)
+
+              expectValues lineNumberStateForScreenRow(presenter, 5), {screenRow: 5, bufferRow: 4, softWrapped: false}
+              expectValues lineNumberStateForScreenRow(presenter, 6), {screenRow: 6, bufferRow: 5, softWrapped: false}
+              expectValues lineNumberStateForScreenRow(presenter, 7), {screenRow: 7, bufferRow: 6, softWrapped: false}
+
             describe ".decorationClasses", ->
               it "adds decoration classes to the relevant line number state objects, both initially and when decorations change", ->
                 marker1 = editor.markBufferRange([[4, 0], [6, 2]], invalidate: 'touch', maintainHistory: true)

src/display-buffer.coffee

@@ -198,13 +198,13 @@ class DisplayBuffer extends Model
   setVerticalScrollbarWidth: (@verticalScrollbarWidth) -> @verticalScrollbarWidth
 
   getHeight: ->
-    @height or 0
+    @height
 
   setHeight: (@height) ->
     @height
 
   getWidth: ->
-    @width or 0
+    @width
 
   setWidth: (newWidth) ->
     oldWidth = @width

src/text-editor-presenter.coffee

@@ -32,6 +32,7 @@ class TextEditorPresenter
     @lineNumberDecorationsByScreenRow = {}
     @customGutterDecorationsByGutterNameAndScreenRow = {}
     @transferMeasurementsToModel()
+    @transferMeasurementsFromModel()
     @observeModel()
     @observeConfig()
     @buildState()
@@ -53,6 +54,9 @@ class TextEditorPresenter
     @model.setLineHeightInPixels(@lineHeight) if @lineHeight?
     @model.setDefaultCharWidth(@baseCharacterWidth) if @baseCharacterWidth?
 
+  transferMeasurementsFromModel: ->
+    @editorWidthInChars = @model.getEditorWidthInChars()
+
   # Private: Determines whether {TextEditorPresenter} is currently batching changes.
   # Returns a {Boolean}, `true` if is collecting changes, `false` if is applying them.
   isBatching: ->
@@ -677,7 +681,6 @@ class TextEditorPresenter
       @updateScrollHeight()
 
     if @contentWidth isnt oldContentWidth
-      @model.setWidth(Math.min(@clientWidth, @contentWidth))
       @updateScrollbarDimensions()
       @updateScrollWidth()
 
@@ -685,9 +688,10 @@ class TextEditorPresenter
     return unless @height? and @horizontalScrollbarHeight?
 
     clientHeight = @height - @horizontalScrollbarHeight
+    @model.setHeight(clientHeight)
+
     unless @clientHeight is clientHeight
       @clientHeight = clientHeight
-      @model.setHeight(@clientHeight)
       @updateScrollHeight()
       @updateScrollTop()
 
@@ -695,9 +699,10 @@ class TextEditorPresenter
     return unless @contentFrameWidth? and @verticalScrollbarWidth?
 
     clientWidth = @contentFrameWidth - @verticalScrollbarWidth
+    @model.setWidth(clientWidth) unless @editorWidthInChars
+
     unless @clientWidth is clientWidth
       @clientWidth = clientWidth
-      @model.setWidth(Math.min(@clientWidth, @contentWidth))
       @updateScrollWidth()
       @updateScrollLeft()
 
@@ -941,9 +946,10 @@ class TextEditorPresenter
       @updateEndRow()
 
   setContentFrameWidth: (contentFrameWidth) ->
-    unless @contentFrameWidth is contentFrameWidth
+    if @contentFrameWidth isnt contentFrameWidth or @editorWidthInChars?
       oldContentFrameWidth = @contentFrameWidth
       @contentFrameWidth = contentFrameWidth
+      @editorWidthInChars = null
       @updateScrollbarDimensions()
       @updateClientWidth()
       @shouldUpdateVerticalScrollState = true

src/text-editor.coffee

@@ -554,6 +554,10 @@ class TextEditor extends Model
   setEditorWidthInChars: (editorWidthInChars) ->
     @displayBuffer.setEditorWidthInChars(editorWidthInChars)
 
+  # Returns the editor width in characters.
+  getEditorWidthInChars: ->
+    @displayBuffer.getEditorWidthInChars()
+
   ###
   Section: File Details
   ###