select: trackBy - preset object, with property not in matching options, makes select dirty

[jakobadam]

Actual Behavior:

• What is the issue? * trackBy on model options for the mdSelect doesn't work as expected. Having a preset value with some extra property, that's not in the matching options object makes the form dirty.
• What is the expected behavior? It shouldn't be dirty.

CodePen (or steps to reproduce the issue): *

• CodePen Demo which shows your issue: https://codepen.io/jakobadam/pen/mBmdJe
• Details: Problem stems from the use of angular.equals here: https://github.com/angular/material/blob/master/src/components/select/select.js#L897

AngularJS Versions: *

• AngularJS Version: 1.5.5
• AngularJS Material Version: 1.1.5

Additional Information:

• Browser Type: * Chrome
• Browser Version: * 61
• OS: * Windows 10
• Stack Traces:

best regards,
Jakob

[Splaktar]

Thank you for the comprehensive and detailed reproduction!

This appears to have been fixed by PR #11156 in 1.1.22. I updated the CodePen to 1.2.1 and the first example appears to be working properly.