contrib/wix/contrib.wxs

transactions: fix hg recover with fncache backups

The transaction backupfiles logic was broken for 'hg recover'.  The file format
is XXX\0XXX\0YYY\0YYY\0 but the parser did a couple things wrong. 1) It went one
step beyond the final \0 and tried to read past the end of the array. 2)
array[i:i+1] returns a single item, instead of two items as intended.

Added a test to catch it, which turns out to be the first actual 'hg recover'
test.

<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">

  <?include guids.wxi ?>
  <?include defines.wxi ?>

  <Fragment>
    <ComponentGroup Id="contribFolder">
      <ComponentRef Id="contrib" />
      <ComponentRef Id="contrib.vim" />
    </ComponentGroup>
  </Fragment>

  <Fragment>
    <DirectoryRef Id="INSTALLDIR">
      <Directory Id="contribdir" Name="contrib" FileSource="$(var.SourceDir)">
        <Component Id="contrib" Guid="$(var.contrib.guid)" Win64='$(var.IsX64)'>
          <File Name="bash_completion" KeyPath="yes" />
          <File Name="hgk" />
          <File Name="hgweb.fcgi" />
          <File Name="hgweb.wsgi" />
          <File Name="logo-droplets.svg" />
          <File Name="mercurial.el" />
          <File Name="tcsh_completion" />
          <File Name="tcsh_completion_build.sh" />
          <File Name="xml.rnc" />
          <File Name="zsh_completion" />
        </Component>
        <Directory Id="vimdir" Name="vim">
          <Component Id="contrib.vim" Guid="$(var.contrib.vim.guid)" Win64='$(var.IsX64)'>
            <File Name="hg-menu.vim" KeyPath="yes" />
            <File Name="HGAnnotate.vim" />
            <File Name="hgcommand.vim" />
            <File Name="patchreview.txt" />
            <File Name="patchreview.vim" />
            <File Name="hgtest.vim" />
          </Component>
        </Directory>
      </Directory>
    </DirectoryRef>
  </Fragment>

</Wix>