mdAutocomplete: auto-select doesn't select if value is re-entered and caching is enabled

[mckenzielong]

Actual behavior:

• What is the issue? * The autocomplete will not auto-select the value if it is re-entered and the built in caching is enabled. For example 'value' gets selected and the callback is fired with 'value'. I remove 'value' and undefined will be provided in the callback. Re-entering 'value' will not trigger the autoselect again. This happens after any value has been auto-selected and removed, and only appears to be happening when the internal cache (aka not using md-no-cache) is used.

probably related to #8768 (item 7 of that issue, though that issue is severely lacking information.)

• What is the expected behavior? The value will be auto-selected again as it was the first time it was auto-selected.

CodePen or Steps to reproduce the issue: *

• CodePen Demo which shows your issue : http://codepen.io/mckenzielong/pen/yJgByz
• Details: First enter the value 'Hawaii' -- it will be auto-selected (note the callback). Tab out to the check box, then shift-tab back and clear the value (note the callback.) Now re-enter 'Hawaii'. The suggestions open up and the value is not automatically selected.

md-no-cache returns the expected behavior.

Angular Versions: *

• Angular Version: 1.5.6
• Angular Material Version: 1.1.0 rc5

Additional Information:

• Browser Type: * Chrome/Opera
• Browser Version: * 50/36
• OS: * Windows 7 64bit
• Stack Traces: N/A

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