[patch] interruptible search in the viewer

[Jindrich Makovicka]

The attached patch makes the search function interruptible by Ctrl-C.

It also removes redundant got_interrupt() calls before
enable_interrupt_key(), as enable_interrupt_key() takes care of clearing
the interrupt flag itself. Furthermore, this feature makes search
virtually uninterruptible, because the flags gets constantly cleared and
the ocassional got_interrupt() check has no chance to catch the
keypress. After removing the disable/enable pair in the middle of the
loop, it works fine. I am not sure it it doesn't interfere with
get_byte() stuff which can do some I/O, but block_search doesn't disable
the interrupts during I/O either.

If you still want to use the approach with temporary disabled
interrupts, please at least move the check right before
enable_interrupt_key(), where it has some sense - it doesn't work 100%,
but it is at least possible to stop the search after a while of Ctrl-C
bashing.

Best regards,
-- 
Jindrich Makovicka
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