Add SimpleFragListBuilder constructor with margin parameter
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Key: LUCENE-3513
URL: https://issues.apache.org/jira/browse/LUCENE-3513
Project: Lucene - Java
Issue Type: Improvement
Components: modules/highlighter
Affects Versions: 3.4
Reporter: Kelsey Francis
Priority: Minor
{{SimpleFragListBuilder}} would benefit from an additional constructor that
takes in {{margin}}. Currently, the margin is defined as a constant, so to
"implement" a {{FragListBuilder}} with a different margin, one has no choice
but to copy and paste {{SimpleFragListBuilder}} into a new class that must be
placed in the {{org.apache.lucene.search.vectorhighlight}} package due to
accesses of package-protected fields in other classes.
If this change were made, the precondition check of the constructor's
{{fragCharSize}} should probably be altered to ensure that it's less than
{{max(1, margin*3)}} to allow for a margin of 0.
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