Scrolled md-virtual-repeat doesn't rerender when the items change

[bsk26]

Actual Behavior:

• What is the issue?
  Scrolled md-virtual-repeat doesn't rerender when the items change for some configurations of the scroll and the item lists. Occurs when it enters this statement,
  https://github.com/angular/material/blame/master/src/components/virtualRepeat/virtual-repeater.js#L700
  but the indexes don't change in updateIndexes so this condition fails,
  https://github.com/angular/material/blame/master/src/components/virtualRepeat/virtual-repeater.js#L659
  And it doesn't reenter the update method and rerender the list with the new items.
• What is the expected behavior?
  Rerenders to show the new items.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue:
  http://codepen.io/benkraft/pen/VjgJNQ
• Details:
  Scroll the list down just a couple of pixels, perhaps so the top border is hidden but all the text on the label "black" is still visible. Click "Switch to new color list". Verify that the list did not switch items. You can reload and click the button without scrolling and it indeed should switch to the correct list.

Angular Versions: *

• Angular Version:
  1.5
• Angular Material Version:
  v1.0.0-rc5 (and earlier)

Additional Information:

• Browser Type: *
  Chrome
• Browser Version: *
  51.0.2704.103
• OS: *
  OS X 10.11.6
• Stack Traces:

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[ThomasBurleson]

@crisbeto - can you investigate as P1 priority ? Thx.