[jdk11u-dev] RFR: 8304350: Font.getStringBounds calculates wrong width for TextAttribute.TRACKING other than 0.0

[Jonathan Dowland]

This is a clean backport of 8304350 for jdk11u-dev.

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Commit messages:
 - Backport 6b9b7d1d921367418f82c2813b272d3447a47595

Changes: https://git.openjdk.org/jdk11u-dev/pull/1889/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1889&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304350
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1889.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1889/head:pull/1889

PR: https://git.openjdk.org/jdk11u-dev/pull/1889