Crashing when the window is minimized. #2618

package test;

import com.jme3.app.SimpleApplication;
import com.jme3.light.DirectionalLight;
import com.jme3.material.Material;
import com.jme3.math.Vector3f;
import com.jme3.post.FilterPostProcessor;
import com.jme3.post.filters.SoftBloomFilter;
import com.jme3.renderer.queue.RenderQueue;
import com.jme3.scene.Geometry;
import com.jme3.scene.shape.Box;
import com.jme3.shadow.DirectionalLightShadowFilter;

public class TestShadowCrash extends SimpleApplication {
    
    @Override
    public void simpleInitApp() {
        Geometry box = new Geometry("", new Box(0.5f, 0.5f, 0.5f));
        box.setMaterial(new Material(getAssetManager(), "Common/MatDefs/Light/Lighting.j3md"));
        box.setShadowMode(RenderQueue.ShadowMode.CastAndReceive);
        rootNode.attachChild(box);
        
        Geometry floor = new Geometry("", new Box(0.5f, 0.5f, 0.5f));
        floor.setMaterial(new Material(getAssetManager(), "Common/MatDefs/Light/Lighting.j3md"));
        floor.setShadowMode(RenderQueue.ShadowMode.CastAndReceive);
        floor.setLocalTranslation(0, -1, 0);
        floor.setLocalScale(5, 1, 5);
        rootNode.attachChild(floor);
        
        DirectionalLight light = new DirectionalLight(new Vector3f(-1, -1, -1));
        rootNode.addLight(light);
        
        FilterPostProcessor fpp = new FilterPostProcessor(assetManager);
        viewPort.addProcessor(fpp);
        
       // Need enabling assertions
        DirectionalLightShadowFilter shadowFilter = new DirectionalLightShadowFilter(assetManager, 512, 2);
        shadowFilter.setLight(light);
        fpp.addFilter(shadowFilter);
        
        // The SoftBloomFilter was also affected.
//        SoftBloomFilter sbf = new SoftBloomFilter();
//        fpp.addFilter(sbf);
        
        // This setting appears to be overridden by FlyCamAppState.
        //getInputManager().setCursorVisible(true);
    }

    @Override
    public void simpleUpdate(float tpf) {
        super.simpleUpdate(tpf);
        // This setting is for testing purposes only.
        getInputManager().setCursorVisible(true);
    }
    
    public static void main(String[] args) {
        TestShadowCrash app = new TestShadowCrash();
        app.start();
    }
}

plugins {
    id 'application'
    id 'java'
}

description = 'test'
compileJava.options.encoding = 'UTF-8'
sourceCompatibility = JavaVersion.VERSION_21
targetCompatibility = JavaVersion.VERSION_21

//ext.jmeVersion = '3.9.0-stable'
ext.jmeVersion = '3.10.0-alpha1'

dependencies {
    implementation "org.jmonkeyengine:jme3-core:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-desktop:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-effects:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-plugins:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-terrain:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-networking:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-jogg:$jmeVersion"
    implementation "org.jmonkeyengine:jme3-lwjgl3:$jmeVersion"
}

sourceSets {
    main {
        java {
            srcDirs = ['src']
        }
        resources {
            srcDirs = ['resource']
        }
    }
}

run {
    enableAssertions = true
}