Don't split lines between Japanese kana & COMBINING KATAKANA-HIRAGANA (SEMI-)VOICED SOUND MARK (#15411)

* Don't split lines between Japanese kana & COMBINING KATAKANA-HIRAGANA (SEMI-)VOICED SOUND MARK

* Add changelog

changelog_unreleased/markdown/15411.md

@@ -0,0 +1,29 @@
+#### Don't split lines between Japanese kana & COMBINING KATAKANA-HIRAGANA (SEMI-)VOICED SOUND MARK (#15411 by @tats-u)
+
+This PR fixes [#15410](https://github.com/prettier/prettier/issues/15410).
+
+Japanese (semi-)voiced kana characters can be split into two code points. For example, the following hiragana character /ka/ can be represented as:
+
+が (U+304C) → か (U+304B) + ゙ (U+3099) → が (U+304C U+3099)
+
+Most users do not use or meet expressions like this except for file paths in macOS. However, there are some characters that can only be represented in this way. Some Japanese text that have to tell /ŋa̠/ (there are not a few Japanese that do not use it these days though) from the common /ga/ use a expression ["か゚" (U+304B U+309A)](https://en.wiktionary.org/wiki/%E3%81%8B%E3%82%9A).
+
+```markdown
+nasalか゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚
+```
+
+The above Markdown is formatted as in Prettier 3.0:
+
+```markdown
+nasalか゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚け
+゚こ゚
+```
+
+The semi-voiced sound mark goes to the next line but it is not correct. By this PR, the source Markdown is now formatted as:
+
+```markdown
+nasalか゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚け゚こ゚か゚き゚く゚
+け゚こ゚
+```
+
+The semi-voiced sound mark now keeps attached to the hiragana "け".

src/language-markdown/print-whitespace.js

@@ -47,7 +47,7 @@ const noBreakAfter = new Set(
  *         `"檜原村（ひのはらむら）\n以外には、"`
  */
 const noBreakBefore = new Set(
-  "!%),.:;?]}¢°·'\"†‡›℃∶、。〃〆〕〗〞﹚﹜！＂％＇），．：；？］｝～–—•〉》」︰︱︲︳﹐﹑﹒﹓﹔﹕﹖﹘︶︸︺︼︾﹀﹂﹗｜､』】〙〟｠»ヽヾーァィゥェォッャュョヮヵヶぁぃぅぇぉっゃゅょゎゕゖㇰㇱㇲㇳㇴㇵㇶㇷㇸㇹㇺㇻㇼㇽㇾㇿ々〻‐゠〜～‼⁇⁈⁉・",
+  "!%),.:;?]}¢°·'\"†‡›℃∶、。〃〆〕〗〞﹚﹜！＂％＇），．：；？］｝～–—•〉》」︰︱︲︳﹐﹑﹒﹓﹔﹕﹖﹘︶︸︺︼︾﹀﹂﹗｜､』】〙〟｠»ヽヾーァィゥェォッャュョヮヵヶぁぃぅぇぉっゃゅょゎゕゖㇰㇱㇲㇳㇴㇵㇶㇷㇸㇹㇺㇻㇼㇽㇾㇿ々〻‐゠〜～‼⁇⁈⁉・゙゚",
 );
 
 /**

tests/format/markdown/splitCjkText/__snapshots__/jsfmt.spec.js.snap

@@ -17,7 +17,10 @@ proseWrap: "always"
 
 カ゚キ゚ク゚ケ゚コ゚でガギグゴ
 
+nasalカ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚
+
 かつてはワ行のワ、ヰ、ヱ、ヲに濁点を付して [v] 音を表現すること（ワ゛、ヰ゛、ヱ゛、ヲ゛）も行われたが、一般的にはならなかった。
+
 =====================================output=====================================
 這是一段很長很長很長很長很長很長很長很長很長很長很長很長很長很長很長很長很長很長
 很長的段落
@@ -32,6 +35,10 @@ proseWrap: "always"
 
 カ゚キ゚ク゚ケ゚コ゚でガギグゴ
 
+nasalカ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚
+ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚
+ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚
+
 かつてはワ行のワ、ヰ、ヱ、ヲに濁点を付して [v] 音を表現すること（ワ゛、ヰ゛、ヱ
 ゛、ヲ゛）も行われたが、一般的にはならなかった。
 

tests/format/markdown/splitCjkText/chinese-japanese.md

@@ -8,4 +8,6 @@
 
 カ゚キ゚ク゚ケ゚コ゚でガギグゴ
 
+nasalカ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚カ゚キ゚ク゚ケ゚コ゚
+
 かつてはワ行のワ、ヰ、ヱ、ヲに濁点を付して [v] 音を表現すること（ワ゛、ヰ゛、ヱ゛、ヲ゛）も行われたが、一般的にはならなかった。