bug#17425: 24.4.50; tramp-cleanup-this-connection on push-button

[Sam Steingold <sds@gnu.org>]

Hi,

To reproduce the problem:

1. edit ~/.ssh/config to make host "zzz" point to a known and working
host to which you have ssh access.

2. start "emacs -Q"; do
C-x d /zzz:~ RET
to start tramp connected to "zzz"

3. edit ~/.ssh/xonfig to remove "zzz"

4. kill the tramp ssh process (find it using `ps aux | grep zzz`).

5. in the "emacs -Q", start irc to create a buffer with
buttons. clicking on these buttons works just fine.

6. Now you need to do something eminently stupid: in the irc buffer with
buttons, evaluate this (using M-: or command eval-expression):
(setq default-directory #("/scp:zzz:/home/.../" 1 4 (tramp-default t)))
(replace "..." with your username)
Now, when you click on the buttons, you get the
tramp-cleanup-this-connection message instead of a new tab in the
browser.

Yes, one should not set default-directory to a remote directory as we do
above.  And, of course, I did not do that intentionally in the process
(long dead since) from which I reported the bug.

Still, this is a bug.  In fact, two bugs:

1. tramp should not be activated on button press
2. tramp's failure should not prevents browse-url from completing its task

Thanks!

-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1265
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