RFR: 8167268: StandardGlyphVector.getGlyphMetrics creates metrics with erroneous bounds for characters with no outline (e.g., the space character ' ') [v2]

[Daniel Gredler]

> `GlyphMetrics` objects returned by `StandardGlyphVector.getGlyphMetrics(int)` contain bounds that are calculated by taking the glyph’s visual bounds and normalizing them by subtracting the glyph’s position.
> 
> However, some glyphs (e.g., the glyph for the space character) do not have visual bounds. Their outline is an empty shape. In such a case the bounds in the metrics should not be normalized by the glyph’s position. The code erroneously ignores this special case, thus producing bounds with inconsistent negative x-positions.

Daniel Gredler has updated the pull request incrementally with one additional commit since the last revision:

  Split long line

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27580/files
  - new: https://git.openjdk.org/jdk/pull/27580/files/516a27a0..810612aa

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27580&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27580&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27580.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27580/head:pull/27580

PR: https://git.openjdk.org/jdk/pull/27580