Streaming xsl:merge logs "building tree" messages (with -t option)
When a streaming xsl:merge is carried out, a "snapshot" tree is built for each selected element in each of the input files.
Saxon incorrectly outputs a "Building tree" message each time it does this, if the -t option is switched on. These messages are misleading, suggesting that the input is not being streamed when it actually is.
Reported by Martin Honnen on saxon-help list.
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