bug(table): Programmatic triggering of sort with cdkDropList does not work

[ChrisWun]

Reproduction

Stackblitz: https://stackblitz.com/edit/angular-material-dllyke?file=app/app.component.html
Steps to reproduce:

1. Sort the Table by column "Name"
2. Drag and Drop one row

Expected Behavior

The Sort triggered by the method onListDrop does sort the table correctly and the sort indicator of the table-header is not shown at the weight (drag handle) column.

Actual Behavior

Sorting does not work with calling MatSort#sort. With two calls, however, it does. The sorting indicator is removed from the "Name" column, but it is not added to the "Weight" column.

The sort order does not seem to work either. The default sort order is "asc". However, if you set "asc" when calling MatSort#sort , the sort order changes.

Environment

• Angular:
• CDK/Material: 8.2.1
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu):

[andrewseguin]

It's not clear to me why the arrow is not correctly appearing by the column. Will need further investigation