Determine how many (if any) of the delimiter characters should be used.
<p>
This allows implementations to decide how many characters to use based on the properties of the delimiter runs.
An implementation can also return 0 when it doesn't want to allow this particular combination of delimiter runs.
@param opener the opening delimiter run
@param closer the closing delimiter run
@return how many delimiters should be used; must not be greater than length of either opener or closer
Determine how many (if any) of the delimiter characters should be used. <p> This allows implementations to decide how many characters to use based on the properties of the delimiter runs. An implementation can also return 0 when it doesn't want to allow this particular combination of delimiter runs.
@param opener the opening delimiter run @param closer the closing delimiter run @return how many delimiters should be used; must not be greater than length of either opener or closer