Prepare formatting refactor (#951)

The test here was expecting that a prefix of 2 spaces before the replaced element is kept. With new formatting we're cleaning up these spaces. So keep the prefix of the original object (also preserving potential comments before the method that gets replaced)

Author: Jenson3210

src/main/java/org/openrewrite/java/migrate/guava/AbstractNoGuavaImmutableOf.java

@@ -110,7 +110,10 @@ public J visitMethodInvocation(J.MethodInvocation method, ExecutionContext ctx)
                         .apply(getCursor(), mi.getCoordinates().replace(), templateArguments);
                 m = m.getPadding().withArguments(mi.getPadding().getArguments());
                 JavaType.Method newType = (JavaType.Method) visitType(mi.getMethodType(), ctx);
-                m = m.withMethodType(newType).withName(m.getName().withType(newType));
+                m = m.withMethodType(newType)
+                        .withName(m.getName().withType(newType))
+                        .withPrefix(mi.getPrefix());
+
                 return super.visitMethodInvocation(m, ctx);
             }