RFR: 8304831: TextFlow.hitTest.insertionIndex incorrect with surrogate pairs [v6]

[Andy Goryachev]

On Fri, 19 May 2023 11:28:10 GMT, Karthik P K <kpk at openjdk.org> wrote:

> value 10084

This character is a U+FE0F Variation Selector-16 
https://codepoints.net/U+FE0F?lang=en

> This codepoint may change the appearance of the preceding character. If that is a symbol, dingbat or emoji, U+FE0F forces it to be rendered as a colorful image as compared to a monochrome text variant.


I suspect the expected behavior is not supported by JavaFX along with emoji modifier sequences (@prrace please confirm) - I see TextArea and TextFlowSurrogatePairInsertionIndexTest both render "\u2764\ufe0f" sequence as a back heart, while Eclipse renders it correctly as a red heart.

For the purposes of this test, we could remove this sequence from the test, I think.

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PR Comment: https://git.openjdk.org/jfx/pull/1091#issuecomment-1554770466