[fixes #2848] Support onX.flagUsage configuration key

test/transform/resource/before/OnXFlagUsage.java

@@ -0,0 +1,21 @@
+//conf: lombok.onX.flagUsage = warning
+//skip compare content: We're just checking if the flagUsage key works.
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+
+@Getter(onMethod_ = @Deprecated)
+@Setter(onMethod_ = @Deprecated, onParam_ = @Deprecated)
+@NoArgsConstructor(onConstructor_ = @Deprecated)
+@AllArgsConstructor(onConstructor_ = @Deprecated)
+public class OnXFlagUsage {
+	private final String a = "";
+	private String b;
+}
+
+@RequiredArgsConstructor(onConstructor_ = @Deprecated)
+class OnXFlagUsage2 {
+	private final String a = "";
+}