bug#16692: 24.2; nlinum version 1.2 does not work correctly with indirect buffers

[Stefan Monnier <monnier@iro.umontreal.ca>]

>     Hit enter multiple times; observe that line numbers for the new
>     lines appear in the original buffer but not the indirect buffer you
>     are currently in.  This is a bug: line numbers should be present for
>     every line in both buffers.
    
The core of the problem is that jit-lock relies on text-properties,
i.e. data shared between the indirect buffers, but is run "per buffer".
This can be seen also when you use two indirect buffers in different
major modes, where the font-lock behavior can be erratic, mixing the
rules of the different major modes.

I installed a patch which prevents activation of jit-lock in indirect
buffers.  In practice this means that nlinum-mode should now work
correctly in the base buffer but will not work at all in the
indirect buffer.
IOW, problem is still present but it fails more cleanly ;-)


        Stefan