[issue26967] argparse: allow_abbrev=False stops -vv from working

[paul j3]

paul j3 added the comment:

It's been 2 years since I worked on this patch.  In the issue discussion http://bugs.python.org/issue14910 there was no mention of short v long options.  The unit tests only look at longs.

The result is that with the abbrev off, it disables all use of combined shorts, not just the count.  Not only if '-vv' disabled, so is '-vz', '-vz1', '-v -z1'.

We should have discussed that issue.

I can imagine modifying the 

    if self.allow_abbrev:

to something like

    if self.allow_abbrev or <argstring has only one dash>:
        <search for abbreviations>

But even if we don't go that far, we should add a documentation note.

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nosy: +paul.j3

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