IDEA-186381 bad code green: variable might already have been assigned

Fixed parentheses handling on the left-side of assignment and in unary operations
Fixed error message priority

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting/AssignToFinal.java

@@ -130,4 +130,16 @@ class T29a {
       if (j > 0) break;
     } while (b == 1);
   }
-}
+}
+class TX {
+  private final int i;
+  private final int j;
+  private final int k;
+  TX() {
+    (i) = 1;
+    (<error descr="Variable 'i' might already have been assigned to">i</error>) = 1;
+    (j) = 1;
+    (<error descr="Variable 'j' might already have been assigned to">j</error>)++;
+    (<error descr="Variable 'k' might not have been initialized">k</error>)++;
+  }
+}