mdCompiler: $onDestroy lifecycle hook never called

[oliversalzburg]

Bug

CodePen and steps to reproduce the issue:

CodePen Demo which demonstrates the issue: https://codepen.io/oliversalzburg/pen/rNaPqrL

Detailed Reproduction Steps:

1. Use $mdPanel to instantiate a controller instance for a dialog.
2. The $onInit lifecycle hook is invoked by the compiler as expected.
3. Destroy the panel.

What is the expected behavior?

The $onDestroy lifecycle hook is invoked.

What is the current behavior?

It is not.

What is the use-case or motivation for changing an existing behavior?

These are standard AngularJS lifecycle hooks that should be expected to work on all controller instances. Especially since $onInit is working as expected.

Which versions of AngularJS, Material, OS, and browsers are affected?

• AngularJS: 1.7
• AngularJS Material: 1.1.20
• OS: Windows
• Browsers: Chrome

Related issues

• Component/Directive lifecycle hooks are not supported  #8153
• mdPanel doesn't destroy controller #8845
• feat(dialog): controller should support AngularJS 1.6 lifecycle events #10567