bug: autoformat gets stuck, won't advance

version: 7.3.34; 7.2.411, 7.2.442
flags: --noplugin -u /dev/null

steps to reproduce:

    press: ":se tw=55 fo+=a<enter>"
    press: "ithis is a test)<esc>"
    press: "i of the emergency broadcast system.  this"

now press space forever and you will never advance, vim
loops between putting the 'this' at end of line and ')'
at first char of next, and putting 'this)' all on
second line.

Some people in #vim reported different behavior, that
7.3.19 does not do this, but instead the cursor jumps
to after the parenthesis magically, when it should not.
I cannot reproduce that myself and do not have 7.3.19.

Also can do:

    press: "10iq<esc>i

now you can press space and it just does nothing,
although 7.3.19 is reported to behave differently,
"keeps moving cursor to the right."  Maybe this is
different and/or not a bug.  First one definitely seems
like a bug to me.

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