mark api as still being subject to change

Author: overheadhunter

src/main/java/org/cryptomator/integrations/tray/TrayIconLoader.java

@@ -1,10 +1,14 @@
 package org.cryptomator.integrations.tray;
 
+import org.jetbrains.annotations.ApiStatus;
+
 /**
  * A callback used by the {@link TrayMenuController} to load tray icons in the format required by the implementation.
  */
+@ApiStatus.Experimental
 sealed public interface TrayIconLoader permits TrayIconLoader.PngData, TrayIconLoader.FreedesktopIconName {
 
+	@FunctionalInterface
 	non-sealed interface PngData extends TrayIconLoader {
 
 		/**
@@ -15,6 +19,7 @@ non-sealed interface PngData extends TrayIconLoader {
 		void loadPng(byte[] data);
 	}
 
+	@FunctionalInterface
 	non-sealed interface FreedesktopIconName extends TrayIconLoader {
 
 		/**