Bug ID: JDK-8309565 [Text] Enhance support for user-perceived characters (grapheme clusters)

JDK-8309565 : [Text] Enhance support for user-perceived characters (grapheme clusters)

Type: Enhancement
Component: javafx
Sub-Component: graphics

Priority: P4
Status: Open
Resolution: Unresolved

Submitted: 2023-06-06
Updated: 2024-05-07

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Other
tbdUnresolved

Related Reports

Relates :	JDK-8089924 - TextField/TextArea: on Windows, it takes two strokes to move the caret over the some complex text cluster.
Relates :	JDK-8303494 - [macos] Incorrect rendering and spacing of emojis with skin tone modifiers
Relates :	JDK-8174266 - Text segmentation revisit
Relates :	JDK-8291660 - Grapheme support in BreakIterator
Relates :	JDK-8300569 - ☂ Missing APIs related to rich text control
Relates :	JDK-8092327 - [Text] Add API to count chars in a cluster

Description

JDK-8291660 (jdk20) enhanced character iterator to handle grapheme clusters (a.k.a. user-perceived characters per https://unicode.org/reports/tr29/ ), yet javaFX renders these clusters as a sequence of symbols.

For example:

🤦🏼‍♂️ - \ud83e\udd26\ud83c\udffc\u200d\u2642\ufe0f
☝🏿- \u261d\ud83c\udfff
🇯🇵 - \ud83c\uddef\ud83c\uddf5
❤️ - \u2764\ufe0f

I think we need to bring javafx in line with the latest BreakIterator behavior.

Comments

Don't forget grapheme clusters in RTL mode (see the sceenshot). ``` \ud83c\uddfa\ud83c\udde6\u2764\ufe0f\ud83c\uddfa\ud83c\uddf8\ud83e\udd8b\ud83c\udfc1\ud83d\udd25 ```

08-02-2024

BreakIterator understanding these sequences is need for text processing and line breaking and we automatically inherited that from JDK 20's update. But this RFE is about rendering of Emoji sequences and that's a different matter. BreakIterator may make it marginally easier in some cases but isn't "enabling" it either.

08-06-2023