X locks after dragging file out of file-roller to pcmanfm

[TimGS]

Looks to be a recurrence of https://bugs.launchpad.net/ubuntu/+source/file-roller/+bug/878993

Dragging a file out of file-roller to pcmanfm sometimes results in the desktop locking up. Applications keep running but will not accept mouse input. Keyboard input mostly accepted, but not the space bar.

Seen on Lubuntu 14.04 64 bit.

-- Tim.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel Letzeisen (dtl131)]

Marking Invalid for file-roller since the issue was claimed to be with pcmanfm in previous bugs.

[Mark (nanite)]

I am seeing this in a fresh install of Lubuntu 17.04 64-bit, also when trying to unpack Tor browser 7.0.5 ( https://www.torproject.org/dist/torbrowser/7.0.5/tor-browser-linux64-7.0.5_en-US.tar.xz ). I'm confirming the following characteristics mentioned about this bug:

* Freeze triggers when mouse moves from file-roller to pcmanfm window.
* Mouse cursor movable but has locked icon, can't click on anything.
* Keyboard still works (can alt-tab between windows) but not spacebar or enter.
* Can do ctrl-alt-F1 to run 'killall file-roller' and unfreeze.

I downloaded the zip file from TimGS, above, and could drag-extract it successfully the first time. But now on a second attempt it also causes a freezing problem.

If it's relevant at all, this is on an Acer Aspire 5820TG laptop, with encrypted disk.

[Mark (nanite)]

Another behaviour I tested: (see related bug https://bugs.launchpad.net/ubuntu/+source/pcmanfm/+bug/1346984 )

* The freeze only occurs when I drag across the 'Places' side pane (the one toggled by pressing F9). If I instead drag into the main area then no freeze occurs.