Handle supplementary code points in StringUtils.splitByCharacterType()

(#1734).

Author: garydgregory

src/changes/changes.xml

@@ -212,6 +212,7 @@ java.lang.NullPointerException: Cannot invoke
     <action                   type="fix" dev="ggregory" due-to="alhudz, Gary Gregory">Fix StringUtils.getDigits dropping supplementary digits (#1729).</action>
     <action                   type="fix" dev="ggregory" due-to="alhudz, Gary Gregory">Keep StrBuilder.reverse from splitting surrogate pairs (#1730).</action>
     <action                   type="fix" dev="ggregory" due-to="alhudz, Gary Gregory">Fix NumberUtils min/max varargs dropping the sign of zero (#1733).</action>
+    <action                   type="fix" dev="ggregory" due-to="alhudz, Gary Gregory">Handle supplementary code points in StringUtils.splitByCharacterType() (#1734).</action>
     <!-- ADD -->
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add JavaVersion.JAVA_27.</action>
     <action                   type="add" dev="ggregory" due-to="Gary Gregory">Add SystemUtils.IS_JAVA_27.</action>