[Grazie][IDEA-243259] Do not split words by right single quotation mark

GitOrigin-RevId: 7736d969c8dafc8ce180a9ebf9e8fe4536d2dba3

plugins/grazie/src/test/testData/ide/language/markdown/Example.md

@@ -61,4 +61,6 @@ das <TYPO descr="Typo: In word 'daert'">daert</TYPO> geschätzt fünf <GRAMMAR_E
 
 Indices are up-to-date.
 Indices are up to date.
-This is an <GRAMMAR_ERROR descr="UP_TO_DATE_HYPHEN">up to date</GRAMMAR_ERROR> product.
+This is an <GRAMMAR_ERROR descr="UP_TO_DATE_HYPHEN">up to date</GRAMMAR_ERROR> product.
+
+Spellcheck doesn’t mind right single quotation mark.

spellchecker/src/com/intellij/spellchecker/inspections/IdentifierSplitter.java

@@ -102,7 +102,8 @@ public class IdentifierSplitter extends BaseSplitter {
           type == Character.OTHER_LETTER ||
           type == Character.MODIFIER_LETTER ||
           type == Character.NON_SPACING_MARK ||
-          type == Character.OTHER_PUNCTUATION
+          type == Character.OTHER_PUNCTUATION ||
+          ch == '\u2019' // right single quotation mark
       ) {
         //letter
         if (s < 0) {

spellchecker/src/com/intellij/spellchecker/inspections/TextSplitter.java

@@ -21,13 +21,15 @@ public class TextSplitter extends BaseSplitter {
 
   private static final String letter = "(\\p{L}\\p{Mn}*)";
   private static final String xmlEntity = "(&.+?;)";
+  private static final String rightSingleQuotationMark = "\\u2019";
+
   // using possessive quantifiers ++ and *+ to avoid SOE on large inputs
   // see https://blog.sonarsource.com/crafting-regexes-to-avoid-stack-overflows/
   private static final Pattern EXTENDED_WORD_AND_SPECIAL = Pattern.compile(
     xmlEntity + "|" +
     "(#|0x\\d*)?" + // an optional prefix
     letter + "++" + // some letters
-    "('" + letter + ")?" + // if there's an apostrophe, it should be followed by a letter
+    "(['" + rightSingleQuotationMark + "]" + letter + ")?" + // if there's an apostrophe, it should be followed by a letter
     "(_|" + letter + ")*+" // more letters and underscores
   );
   @Override