Properly reset the size of layers on resize

Otherwise, when a theme has padding in the scroll-view, it will be 
scrollable all the time (width:100%).

src/editor.coffee

@@ -774,6 +774,7 @@ class Editor extends View
       @setHeightInLines()
       @setWidthInChars()
       @requestDisplayUpdate()
+      @updateLayerDimensions()
     @focus() if @isFocused
 
     if pane = @getPane()
@@ -1155,7 +1156,7 @@ class Editor extends View
       @verticalScrollbarContent.height(@layerHeight)
       @scrollBottom(height) if @scrollBottom() > height
 
-    minWidth = @charWidth * @getMaxScreenLineLength() + 20
+    minWidth = @scrollView.width()
     unless @layerMinWidth == minWidth
       @renderedLines.css('min-width', minWidth)
       @underlayer.css('min-width', minWidth)

static/editor.less

@@ -101,12 +101,6 @@
   overflow-x: hidden;
 }
 
-.editor .underlayer,
-.editor .lines,
-.editor .overlayer {
-  width: 100%;
-}
-
 .editor .underlayer {
   z-index: 0;
   position: absolute;