Auto-indent and undo causes crashes

[Liu Hao]

Gentle Benno,

It looks like 1961c052c85394d1dfb5d2d98d31f154757c8d08 introduced a bug
that causes nano to crash, as follows:

0) Run `nano -Ii`.
1) Type `      a`. Leading spaces are intentional.
2) Press <Left>. This places the cursor just preceding `a`.
3) Press <Enter>. This inserts a blank line before it.
4) Press M-U. This is expected to undo the insertion, but please
   note that leading spaces are gone now.
5) Press M-U once more. This causes nano to crash. Error messages
   vary from SIGSEGV, SIGBUS to 'Nano is out of memory!'.

Hope it helps.

-- 
Best regards,
LH_Mouse

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