[java-inspections] EscapedSpaceInspection: proper unicode escape support

GitOrigin-RevId: 4595d28c6b09fa8ab5e1afe63cc34f95c5a17a86

java/java-tests/testData/codeInspection/escapedSpace/afterWithUnicode.java

@@ -0,0 +1,8 @@
+// "Replace '\s' sequences with spaces" "true-preview"
+class X {
+  void test(String str) {
+    if (str.matches("\uuu1234 +")) {
+
+    }
+  }
+}

java/java-tests/testData/codeInspection/escapedSpace/beforeWithUnicode.java

@@ -0,0 +1,8 @@
+// "Replace '\s' sequences with spaces" "true-preview"
+class X {
+  void test(String str) {
+    if (str.matches("\uuu1234<caret>\s+")) {
+
+    }
+  }
+}

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/style/EscapedSpaceInspection.java

@@ -42,8 +42,10 @@ public class EscapedSpaceInspection extends AbstractBaseJavaLocalInspectionTool
       if (pos == -1 || pos == text.length() - 1) break;
       char next = text.charAt(pos + 1);
       if (next == 'u') {
-        // unicode escape
-        pos += 6;
+        // unicode escape can contain several 'u', according to the spec
+        pos += 2;
+        while (pos < text.length() && text.charAt(pos) == 'u') pos++;
+        pos += 4;
         continue;
       }
       pos += 2;