[MdAutoComplete] Result list disappears and does not render regardless of input

[MichaelJamesParsons]

I encountered this bug while giving a demo to a client. Using this component under normal circumstances (without trying to break it), the result window will occasionally stop rendering.

Steps to reproduce

This bug can be reproduced using the example code on the documentation site:

1. Create a project using the md-autocomplete component example code.
2. Type random gibberish into the country input. Erase it as quickly as possible.
3. Repeat step 2 until results no longer appear, regardless of your input.
   (It can usually be reproduced with a couple seconds of doing this)

The vue debug tools shows the component correctly sets its properties:
showMenu: true
triggerPopover: true

...yet the result window is not rendered.

Which browser?

Windows 10
Google Chrome v69.0

What is expected?

The autocomplete input should list results relevant to input text.

What is actually happening?

The result window stops rendering, even if the input value matches items in the result list.

Reproduction Link

Example code

[Samuell1]

Autocomplete is a little bit a not useful for now. It needs to be reworked. #1338

[Byronsargeant]

This issue is still present nearly 1 year later.

[Byronsargeant]

Hiding and re-rendering the autocomplete field was the work I used!