Always move the hidden input element to the cursor's screen location

This avoids spuriously auto-scrolling to the left when opening an autocomplete in an editor that's scrolled to the right.

src/app/cursor-view.coffee

@@ -38,6 +38,7 @@ class CursorView extends View
 
     if @cursor == @editor.getLastCursor()
       @editor.scrollTo(pixelPosition)
+      @editor.hiddenInput.css(pixelPosition)
 
     @setVisible(@cursor.isVisible() and not @editor.isFoldedAtScreenRow(screenPosition.row))
 

src/app/editor.coffee

@@ -17,10 +17,10 @@ class Editor extends View
 
   @content: (params) ->
     @div class: @classes(params), tabindex: -1, =>
-      @input class: 'hidden-input', outlet: 'hiddenInput'
       @subview 'gutter', new Gutter
       @div class: 'scroll-view', outlet: 'scrollView', =>
         @div class: 'lines', outlet: 'renderedLines', =>
+          @input class: 'hidden-input', outlet: 'hiddenInput'
       @div class: 'vertical-scrollbar', outlet: 'verticalScrollbar', =>
         @div outlet: 'verticalScrollbarContent'
 

static/editor.css

@@ -104,7 +104,7 @@
 }
 
 .editor .hidden-input {
-  position: fixed;
+  position: absolute;
   z-index: -1;
   top: 0;
   left: 0;