Soft hyphens should never render, regardless of the rendering path used internally.
This PR does not expand the categorization of "complex" characters in `FontUtilities` in order to force the use of `TextLayout` rendering code paths (as was discussed in JBS). Instead, it takes the existing (limited) format-category checks in `sun.font.CMap` (a TrueType font helper class), expands it to a more general / complete default-ignorable check (`FontUtilities.isDefaultIgnorable(int)`), and then moves these checks out of `CMap` and up a level into the `CharToGlyphMapper` classes themselves. The Type1 and TTF glyph mappers have been updated, but the macOS glyph mapper has not been updated. ------------- Commit messages: - Always use invisible glyphs for 'default ignorable' chars Changes: https://git.openjdk.org/jdk/pull/22670/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22670&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8208377 Stats: 348 lines in 5 files changed: 325 ins; 15 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/22670.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22670/head:pull/22670 PR: https://git.openjdk.org/jdk/pull/22670
