Set .hidden-input to fixed position so we don't have to move it when the cursor moves

spec/atom/editor-spec.coffee

@@ -196,18 +196,11 @@ describe "Editor", ->
       it "moves the cursor to the character at the given row and column", ->
         expect(editor.getCursor().position()).toEqual(top: 2 * editor.lineHeight, left: 2 * editor.charWidth)
 
-      it "moves the hidden input element to the position of the cursor to prevent scrolling misbehavior", ->
-        expect(editor.hiddenInput.position()).toEqual(top: 2 * editor.lineHeight, left: 2 * editor.charWidth)
-
       describe "if soft-wrap is enabled", ->
         beforeEach ->
           setEditorWidthInChars(editor, 20)
           editor.setSoftWrap(true)
 
-        it "doesn't move the hidden input beyond the right side of the horizontal scroller to prevent chrome from auto-scrolling", ->
-          editor.setCursorScreenPosition([4, 20])
-          expect(editor.hiddenInput.position()).toEqual(top: 4 * editor.lineHeight, left: editor.horizontalScroller.width() - editor.charWidth)
-
     describe "when the arrow keys are pressed", ->
       it "moves the cursor by a single row/column", ->
         editor.trigger keydownEvent('right')

src/atom/editor.coffee

@@ -141,12 +141,6 @@ class Editor extends View
     @hiddenInput.on "textInput", (e) =>
       @insertText(e.originalEvent.data)
 
-    @on 'cursor:position-changed', =>
-      position = @pixelPositionForScreenPosition(@cursor.getScreenPosition())
-      if @softWrap
-        position.left = Math.min(position.left, @horizontalScroller.width() - @charWidth)
-      @hiddenInput.css(position)
-
     @horizontalScroller.on 'scroll', =>
       if @horizontalScroller.scrollLeft() == 0
         @gutter.removeClass('drop-shadow')

static/editor.css

@@ -73,7 +73,7 @@
 }
 
 .editor .hidden-input {
-  position: absolute;
+  position: fixed;
   z-index: -1;
   top: 0;
   left: 0;