Revert "Listen for mouse events on scrollView instead of renderedLines"

You can't listen on scroll view because that makes
it impossible to scroll using the scrollbar

Opens #464

This reverts commit fdae5fd89c.

src/app/editor.coffee

@@ -835,12 +835,13 @@ class Editor extends View
       $(clickedElement).trigger(e)
       false if @isFocused
 
-    @scrollView.on 'mousedown', '.fold.line', (e) =>
+    @renderedLines.on 'mousedown', '.fold.line', (e) =>
       @destroyFold($(e.currentTarget).attr('fold-id'))
       false
 
-    @scrollView.on 'mousedown', (e) =>
+    onMouseDown = (e) =>
       clickCount = e.originalEvent.detail
+
       screenPosition = @screenPositionFromMouseEvent(e)
       if clickCount == 1
         if e.metaKey
@@ -856,6 +857,8 @@ class Editor extends View
 
       @selectOnMousemoveUntilMouseup() unless e.ctrlKey or e.originalEvent.which > 1
 
+    @renderedLines.on 'mousedown', onMouseDown
+
     @on "textInput", (e) =>
       @insertText(e.originalEvent.data)
       false