[Bug-readline] Cursor movement with Meta prefix ignored while in incsearch mode

[Davor Cubranic]

In my .inputrc, I have M-j and M-l bound to backward-char and forward-char, 
respectively. With Bash 4.1.5 and libreadline-6.1-1 on Ubuntu 10.04.1 (Lucid), 
when I'm incrementally searching through the history and press one of these 
keys, the cursor moves according to the key, and I'm taken out of the search 
mode.

With Bash 4.2.8 and libreadline 6.2-0ubuntu1 on Ubuntu 11.04 (Natty), these 
keys are ignored. 

It's possible that this bug was inadvertently introduced in the fix that 
allowed Meta-prefixed keybindings to reverse/forward-search-history to advance 
to the next match when pressed while in the search mode. [1] The problem is 
that now the next-match key works, but all other Meta-prefixed keybindings are 
ignored.

Davor

[1] http://lists.gnu.org/archive/html/bug-readline/2010-08/msg00008.html