[OpenJDK 2D-Dev] RFR: 8256372: [macos] Unexpected symbol was displayed on JTextField with Monospaced font

[Erik Joelsson]

On Tue, 18 May 2021 15:55:09 GMT, Phil Race <prr at openjdk.org> wrote:

> See the bug report for lots of explanation.
> The short version (not that short) is that Swing adds a new line char to editable TextComponents
> It used to work because harfbuzz asked CoreText which mapped it to an invisible glyph
> Now harfbuzz does its own processing of AAT fonts it is different.
> Harfbuzz looks up the mapping for this but there is none so it gets a missing glyph.
> 
> Solution: Since HB now does AAT processing we can dispense with all the special handling of that case
> and core text and just treat AAT fonts like OT fonts. 
> This means its gets the same mapping we get when not using Layout.
> 
> And the test passes on all platforms .. not just macOS ..

Build changes look ok.

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Marked as reviewed by erikj (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4097