SortContentAction: consider error element as separator between sortable entries (IDEA-214843)

GitOrigin-RevId: cda0be0ead288decd24b5dffe9ed00c327e7b14e

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/sortContent/afterEnumComments7.java

@@ -0,0 +1,16 @@
+// "Sort content" "true"
+
+enum Colors {
+    CLUBS,
+    DIAMOND,
+    HEARTS,
+    SPADES
+
+
+    public enum Direction {
+        UP, DOWN
+    }
+
+    //1
+
+    }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/sortContent/beforeEnumComments7.java

@@ -0,0 +1,15 @@
+// "Sort content" "true"
+
+enum Colors {
+  SPADES,
+  DIAMOND,
+  HEARTS,
+  CLU<caret>BS
+
+  public enum Direction {
+    UP,DOWN
+  }
+
+  //1
+
+}