Picklist dragdrop input can't disable drag and drop

[ramonvanbezouw]

Issue
Docs specify the dragdrop input for enabling / disabling drag and drop for the Picklist component:

dragdrop	boolean	false	Whether to enable dragdrop based reordering.

This feature does not work.

Expected behavior:
Setting [dragdrop]="false" on <p-picklist> should disable drop behaviour for the items.

Actual behavior:
Drag and drop of items in <p-picklist> always works, regardless of the setting.

Minimal reproduction of the problem with instructions
In the showcase change [dragdrop]="true" to [dragdrop]="false", drag will still work.

Proposed fix: (PR: #10036)
The dragdrop Input is not being used by the component. Adding [cdkDropListDisabled]="!dragdrop" to the source and target cdkDropList, the dragdrop input works as expected.

Fix was tested in Windows Chromium 89, Windows Firefox 87, iOS Safari 14.

[cm-noesis]

I was also looking for this. If the picklist is disabled, drag&drop is still allowed.