Commits on Sep 23, 2015

1. fix(mdTooltip): Tooltip inside subheader causes Firefox hang. …

   When a `<md-tooltip>` was placed inside the `<md-subheader>`,
   an infinite loop was being hit (only in Firefox) which was
   causing the browser to hang.
   
   The infinite loop was caused by the tooltip's
   `getParentWithPointerEvents()` method which travels up the
   DOM looking for a parent who has pointer events. In Firefox,
   the `element.parent()` can apparently return an empty jqLite
   object that is not null, but whose length is 0. In this case,
   calling `parent.parent()` again will return the same object.
   
   Add a check to the tooltip's loop to ensure that `parent.length`
   is never 0.
   
   Fixes #4777.

   

   topherfangio committed Sep 23, 2015
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