Drag and Drop cdkDropListDisabled odd binding

[wratho]

Reproduction

https://stackblitz.com/edit/angular-bj2u4w (working example)
https://stackblitz.com/edit/angular-4pnl1v (broken example)

When you the cdkDropListDisabled limit it appears that the next operation isn't setting the disable back to enabled.

In these examples there is a limit on the todo where the todo list should be drag disabed when it has only 1 item and the done list should be drag disabled when the todo list has 6 or more in it.

Reproduce:
Move all but 1 item from todo and notice that you cannot move the final item out of todo list.
Move 1 from done back to todo. This SHOULD allow you to move an item from todo back to done since the limit for cdkDropListDisabled has been removed.
Notice that you cannot move from todo until you move a 3rd into todo. It is fixed if you drop or even just enter the 3rd item into the todo list.

other way of breaking:
Move 6 items into todo and notice you cannot move a 7th item into todo
Move 1 from todo to done. This SHOULD allow you to move an item from done into todo.
Notice you cannot move from done into todo until you reduce the todo count to 4. It is fixed by dropping OR simply entering the done list from todo.

Expected Behavior

When the cdkDropListDisabled becomes false it should actually let me interact with the draggable list again.

Actual Behavior

cdkDropListDisabled is not re-enabling the list after the first operation that makes it false.

Environment

• Angular: 8.2
• CDK/Material: 8.2
• Browser(s): Edge, Chrome, Firefox
• Operating System (e.g. Windows, macOS, Ubuntu): Windows 10

[wratho]

Thanks for the quick turn around on this!

[wratho]

Was curious when we were expecting this to be live.

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