Fix GroovyParserVisitor cast dispatch for parenthesized expressions (#7470)

`visitCastExpression` distinguished Java-style `(Type) expr` from
Groovy `as`-style `expr as Type` by peeking at `source.charAt(cursor)`:
if the next character was `(`, assume Java-style. For an expression
like `(foo as Bar).name as Set`, the outer `as`-style cast's expression
itself starts with `(`, so the parser took the Java-style branch,
mis-parsed the cast as a C-style cast, and produced an LST that failed
print idempotency. Downstream, this can cascade into later parse
failures (observed as `Failed to parse ... at cursor position N` on
unrelated single-quoted strings far past the actual offending cast).

Use `CastExpression#isCoerce()` — the Groovy AST's authoritative flag
for `as`-style coercion — instead of peeking at the source.

Author: knutwannheden

rewrite-groovy/src/main/java/org/openrewrite/groovy/GroovyParserVisitor.java

@@ -1482,8 +1482,10 @@ private J.Case visitDefaultCaseStatement(BlockStatement statement) {
         @Override
         public void visitCastExpression(CastExpression cast) {
             queue.add(insideParentheses(cast, prefix -> {
-                // Might be looking at a Java-style cast "(type)object" or a groovy-style cast "object as type"
-                if (source.charAt(cursor) == '(') {
+                // Java-style cast "(type)object" vs groovy-style cast "object as type".
+                // Can't detect by looking at cursor character because the expression
+                // itself may start with '(' (e.g. "(foo as Bar).name as Set").
+                if (!cast.isCoerce()) {
                     skip("(");
                     return new J.TypeCast(randomId(), prefix, Markers.EMPTY,
                             new J.ControlParentheses<>(randomId(), EMPTY, Markers.EMPTY,

rewrite-groovy/src/test/java/org/openrewrite/groovy/tree/CastTest.java

@@ -123,4 +123,15 @@ void javaCastAndInvokeMethodWithParentheses() {
           )
         );
     }
+
+    @Test
+    void asStyleCastOfParenthesizedCast() {
+        rewriteRun(
+          groovy(
+            """
+              def x = (foo as Bar).name as Set
+              """
+          )
+        );
+    }
 }