Open Radar

 
Area:
Dock

Summary:
Dragging a file from the Dock (via the pop-up windows that show when opening a folder in the Dock) into another application or context (I've noticed this when dragging files to the Trash or into a web browser) causes an error (logs attached) that then causes the Dock to enter a state where no animations play, including opening pop-up windows.

Steps to Reproduce:
Starting from a fresh boot, or after running "killall Dock":

1. Have two or more test files in a folder (I used images)
2. Add this folder to the Dock
3. Use the following window settings:
    - Display as: Folder
    - View content as: Automatic
4. Open the folder with a single-click to get the pop-up window
5. Drag one file from the folder to the Trash icon in the Dock
6. Repeat steps 4 and 5.

Expected Results:
The Dock continues to function normally.

Actual Results:
On step 6, expect the machine to hang briefly. The typical Trash sound will not play. It is now impossible to view folder pop-up windows from the Dock. Window effects associated with shrinking or expanding applications to/from the Dock will not play. Clicking on an icon in the Dock will not trigger the "depress" animation.

Version:
macOS Sierra 10.12.2 (16C67)

Notes:


Configuration:
MacBook Pro 15" Late 2016, 2.9 GHz Intel Core i7, Intel HD Graphics 530

Crash log:
Jan  2 13:39:43 **** Dock[26786]: BUG in libdispatch client: kevent[EVFILT_MACHPORT] monitored resource vanished before the source cancel handler was invoked
Jan  2 13:40:29 **** com.apple.xpc.launchd[1] (com.apple.Dock.agent[26786]): Service exited with abnormal code: 1
Jan  2 13:40:30 **** com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit