Fix issue 412 (select with href or child node always sorts nodes and eliminates duplicates)

[AirQuick]

This pull request derives from #411. So needs to be handled after that.

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Fixes #412 for XSLT. (Unfortunately I don't know how to fix it for XQuery.)

The problem is that mode="test:generate-variable-declarations" template generates variable declarations using / operator like this:

<xsl:variable name="d29e1" select="$d29e1-doc/(//e2, //e1, //e1)"/>

With this pull request, the variable is declared like this

<xsl:variable name="d29e1" as="item()*">
   <xsl:for-each select="$d29e1-doc">
      <xsl:sequence select="//e2, //e1, //e1"/>
   </xsl:for-each>
</xsl:variable>

without using /.

Commits

• b7bed17 reproduces the problem (Travis, AppVeyor)
• f1cfe09 fixes XSLT
• 92db219 simplifies an expression in one of the tests. The expression had to be weird, before fixing this problem.

[AirQuick]

@cirulls
Merged this bug fix.

@galtm
#475 has a small conflict with this change in generate-tests-helper.xsl. I think it's easy to resolve.
As written in the initial comment here, the goal of the change is replacing this pattern of variable declaration

<xsl:variable name="d29e1" select="$d29e1-doc/(//e2, //e1, //e1)"/>

with this pattern

<xsl:variable name="d29e1" as="item()*">
   <xsl:for-each select="$d29e1-doc">
      <xsl:sequence select="//e2, //e1, //e1"/>
   </xsl:for-each>
</xsl:variable>

[galtm]

#475 has a small conflict

@AirQuick
OK, I will take a look in the next few days.

[galtm]

#475 has a small conflict with this change in generate-tests-helper.xsl.

@AirQuick
I pushed commit 09219e7 to PR #475. It should be basically a reinsertion of my change into the latest master revision of the file. I had to insert part of my code in a different spot to adapt to your changes.

[AirQuick]

@galtm
I should have mentioned that xsl:element had been consolidated and thus you would need a tweak after reinsertion. 😎

[galtm]

xsl:element had been consolidated

I should have noticed in any case. I uploaded to #475 a better adaptation to your changes: 428a711.