Material: md-autocomplete: infinite progress bar after clearing with cached queries

[achaussende]

Actual behavior:

• The loading bar under the input is appearing and stay for infinite amount of time after clearing the md-autocomplete.
• The loading bar should not appear.

Steps to reproduce the issue:
You can reproduce it on the md-autocomplete basic usage demo:

• Select _Simulate query_ for results
• Uncheck _Disable caching of queries_
• Select one item
• Clear

CodePen:
CodePen

Angular Versions:
I spotted this issue on my own app:

• Angular Version: 1.4.10
• Angular Material Version: 1.0.8 but the issue is still on master version. (cf demo)

Additional Information:

• Browser Type: Chrome
• Browser Version: 50.0.2661.94 m
• OS: Windows 8.1

NB: The issue does not happen in release 1.0.0 of Angular Material.
It does not happen with md-no-cache="true" either.

[Wsiegenthaler]

I also ran across this last week with 1.07 and Angular 1.5.3. For now I've just hidden the progress indicator but this is only acceptable because my queries are always local.

md-autocomplete md-progress-linear { display: none; }

A couple things I've noticed which may or may not be relevant:

• The progress bar also appears when caching is disabled though it disappears again after a split second.
• This issue also occurs when the field is cleared by pressing escape.

[RolandHeath]

This is related to and possibly a duplicate of #8195, #7927 is also relevant.
It might be worth merging these issues, or closing one of them.

[achaussende]

I can't reproduce it in releases 1.0.0 - 1.0.6. The issue happens in 1.0.7, 1.0.8 and on master.

I can confirm: the progress bar appears also when pressing escape.