Read remote image and hangs

[Leo]

Hello Michael,

Sorry I have posted so many questions.

Some emacs packages such as preview.el from AUCTeX use image spec with a
:file property.

When this points to a remote file it causes hangs that cannot be stopped
by C-g. This seems due to image loading is done inside BLOCK_INPUT, so
C-g does not work until it finishes. Such hangs are very painful since
brutally killing emacs is often the only option left.

BT and BT-FULL can be found in:

  http://paste.pocoo.org/show/216560/
  http://paste.pocoo.org/show/216564/

Is there something that can be done about this? Thank you.

Leo