Please describe the problem:
I have a select expression in xsl:for-each that has an union operator and ".", instead of selecting the 
current node, "." selects all the child nodes.

Steps to reproduce:
1. test xml document:
<?xml version="1.0" encoding="UTF-8"?>
<root>
  <element>I'm root's element</element>
  <child>
    <element>I'm child's element</element>
  </child>
</root>

2. Test style sheet:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="root">
  <xsl:for-each select='./group|.'>
    <xsl:value-of select="./element"/>
  </xsl:for-each>
</xsl:template>
</xsl:stylesheet>
3. Process with this command:
xsltproc test.xsl test.xml


Actual results:
<?xml version="1.0"?>
I'm child's element


Expected results:
<?xml version="1.0"?>
I'm root's element


Does this happen every time?
Yes

Other information:
I recently upgraded from 2.6.11 to 2.6.20. 2.6.11 does not have this problem, problem occured only after 
upgraded to 2.6.20.

Also, I noticed a similar bug, 306348, was reported and fixed before 2.6.20 release.