[Conkeror] isearch bug in find.js

[Nick]

1. Open a fresh conkeror.
2. Load developer.mozilla.org in the default buffer.
3. Load developer.mozilla.org in a new buffer.
4. C-s to isearch results in exception.

Occurs in current git, checked out Tue, 26 Aug 2008 12:23:29 -0400 (about
ten minutes ago). Confirmed by gzeus on IRC.

Sketch on IRC tested using his build from Friday (though he used a new
window instead of a fresh conkeror) and was unable reproduce the problem, so
it may be caused by changes committed between Friday and yesterday.

Trace:

NS_NOINTERFACE: Component returned failure code: 0x80004002 (NS_NOINTERFACE)
[nsIInterfaceRequestor.getInterface]
getFocusedSelCtrl()@chrome://conkeror-modules/content/find.js:44
isearch_session()@chrome://conkeror-modules/content/find.js:87
isearch_start()@chrome://conkeror-modules/content/find.js:341
anonymous()@chrome://conkeror-modules/content/find.js:345
call_interactively()@chrome://conkeror-modules/content/interactive.js:111
key_press_handler()@chrome://conkeror-modules/content/keyboard.js:632
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