Request for review: 7124223: [macosx] Regression test failure with new exception, when glyph is positioned explicitly

[Andrew Brygin]

Hello,

  there is a small fix for a regression test failure.

  Note that PathGrapics uses a glyph codes as a indexes in an array
  in order to provide a mapping from glyph codes back to unicode
  characters. So, it assumes that glyph code is not negative.

  However it is not true in case of macosx: if there is no glyph
  in a font for some character, then macosx font support machinery
  returns negative unicode char in order to indicate that this char
  requires a substitution (CoreTextSupport.m, lines 92 - 126).

  Suggested fix just ignores negative glyph codes in PathGrapics.

  Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7124223
  Webrev: http://cr.openjdk.java.net/~bae/7124223/webrev/

Thanks,
Andrew