IDEA-133955 ("Unnecessary unicode escape sequence" is triggered for surrogate characters.)

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/internationalization/UnnecessaryUnicodeEscapeInspection.java

@@ -156,13 +156,14 @@ public class UnnecessaryUnicodeEscapeInspection extends BaseInspection {
           charBuffer.clear();
           charBuffer.put(d).rewind();
           final CoderResult coderResult = encoder.encode(charBuffer, byteBuffer, true);
-          if (!coderResult.isUnmappable()) {
-            final PsiElement element = file.findElementAt(i);
-            if (element != null && isSuppressedFor(element)) {
-              return;
-            }
-            registerErrorAtOffset(file, i, escapeEnd - i, Character.valueOf(d));
+          if (coderResult.isError()) {
+            continue;
           }
+          final PsiElement element = file.findElementAt(i);
+          if (element != null && isSuppressedFor(element)) {
+            return;
+          }
+          registerErrorAtOffset(file, i, escapeEnd - i, Character.valueOf(d));
         }
       }
     }

plugins/InspectionGadgets/test/com/siyeh/igtest/internationalization/unnecessary_unicode_escape/UnnecessaryUnicodeEscape.java

@@ -3,6 +3,8 @@ package com.siyeh.igtest.internationalization.unnecessary_unicode_escape;
 class UnnecessaryUnicodeEscape {
   // <warning descr="Unicode escape sequence '\uuuuuu0061' can be replaced with 'a'">\uuuuuu0061</warning><warning descr="Unicode escape sequence '\u0062' can be replaced with 'b'">\u0062</warning>
   // control char & not representable char: \u0010 \u00e4
+
+  char[] surrogates = new char[]{'\ud800','\udc00'};
 }
 @SuppressWarnings("UnnecessaryUnicodeEscape")
 class Suppress {