Use a crash callable instead of a mixin for GLWindow

src/hdskins/java/com/voxelmodpack/hdskins/HDSkins.java

@@ -9,6 +9,8 @@ import net.minecraft.client.Minecraft;
 import net.minecraft.client.resources.IReloadableResourceManager;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.fml.client.registry.RenderingRegistry;
+import net.minecraftforge.fml.common.FMLCommonHandler;
+import net.minecraftforge.fml.common.ICrashCallable;
 import net.minecraftforge.fml.common.Mod;
 import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
 import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
@@ -53,7 +55,20 @@ public class HDSkins {
             }
         }
 
-//        GLWindow.current();
+        // Create a bogus crash callable so we can properly close the window in case of a crash.
+        FMLCommonHandler.instance().registerCrashCallable(new ICrashCallable() {
+            @Override
+            public String getLabel() {
+                return "HDSkins";
+            }
+
+            @Override
+            public String call() {
+                GLWindow.dispose();
+                return "";
+            }
+        });
+
     }
 
     private boolean fullscreen;

src/hdskins/java/com/voxelmodpack/hdskins/gui/GLWindow.java

@@ -1,7 +1,6 @@
 package com.voxelmodpack.hdskins.gui;
 
 import com.google.common.collect.Lists;
-
 import net.minecraft.client.Minecraft;
 import net.minecraft.client.resources.DefaultResourcePack;
 import net.minecraft.util.ResourceLocation;
@@ -24,7 +23,6 @@ import javax.swing.*;
 
 /**
  * Experimental window to control file drop. It kind of sucks.
- *
  */
 public class GLWindow extends DropTarget {
 
@@ -74,6 +72,8 @@ public class GLWindow extends DropTarget {
 
     private boolean isFullscreen;
 
+    private boolean open;
+
     private GLWindow() {
         try {
             open();
@@ -95,13 +95,17 @@ public class GLWindow extends DropTarget {
         canvas = new Canvas();
 
         frame = new JFrame(Display.getTitle());
-        frame.add(canvas);
+        frame.getContentPane().add(canvas);
         frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
         frame.addWindowListener(new WindowAdapter() {
             @Override
             public void windowClosed(WindowEvent windowEvent) {
+                // If we don't check this, exiting the skins menu
+                // will shutdown minecraft.
+                if (open) {
                     mc.shutdown();
                 }
+            }
 
             @Override
             public void windowStateChanged(WindowEvent event) {
@@ -139,9 +143,13 @@ public class GLWindow extends DropTarget {
 
         Display.setParent(canvas);
         Display.setFullscreen(isFullscreen);
+
+        open = true;
     }
 
     private void close() {
+        open = false;
+        clearDropTargetListener();
         try {
             Display.setParent(null);
         } catch (LWJGLException e) {
@@ -197,7 +205,9 @@ public class GLWindow extends DropTarget {
     }
 
     private void onRefresh(boolean fullscreen) {
-        if (fullscreen != isFullscreen) {
+        if (fullscreen) {
+            close();
+        } else if (open) {
             // Repaint the canvas, not the window.
             // The former strips the window of its state. The latter fixes a viewport scaling bug.
             canvas.setBounds(0, 0, 0, 0);
@@ -206,7 +216,7 @@ public class GLWindow extends DropTarget {
         }
     }
 
-    public void clearDropTargetListener() {
+    private void clearDropTargetListener() {
         if (dropListener != null) {
             removeDropTargetListener(dropListener);
             dropListener = null;

src/hdskins/java/com/voxelmodpack/hdskins/gui/GuiSkins.java

@@ -194,10 +194,12 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
     }
 
     private void enableDnd() {
+        if (!mc.isFullScreen()) {
             GLWindow.current().setDropTargetListener((FileDropListener) files -> {
                 files.stream().findFirst().ifPresent(instance::loadLocalFile);
             });
         }
+    }
 
     private void initPanoramaRenderer() {
         this.viewportTexture = this.mc.getTextureManager().getDynamicTextureLocation("skinpanorama", new DynamicTexture(256, 256));
@@ -210,7 +212,7 @@ public class GuiSkins extends GuiScreen implements FutureCallback<SkinUploadResp
         remotePlayer.releaseTextures();
         HDSkinManager.clearSkinCache();
 
-        GLWindow.current().clearDropTargetListener();
+        GLWindow.dispose();
     }
 
     private void onFileOpenDialogClosed(JFileChooser fileDialog, int dialogResult) {

src/hdskins/java/com/voxelmodpack/hdskins/mixin/MixinMinecraft.java

@@ -1,78 +0,0 @@
-package com.voxelmodpack.hdskins.mixin;
-
-import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
-
-import com.voxelmodpack.hdskins.gui.GLWindow;
-
-import net.minecraft.client.Minecraft;
-import net.minecraft.crash.CrashReport;
-
-/**
- * Mixin required to close the window after the game detects a crash.
- *
- * DO NOT REMOVE
- *
- * That means you, Killjoy.
- *
- */
-@Mixin(Minecraft.class)
-public abstract class MixinMinecraft {
-    //
-    // Due to how JFrame works the only way to know for sure when the game hash crashed
-    // is to have it call us explicitly.
-    //
-    // ShutdownListener.onShutDown is unlikely to be called as it depends on the
-    // Minecraft.running flag to be unset, which is unlikely to happen if the game crashes.
-    //
-    // Runtime.current().addShutdownHook won't be called it waits for all
-    // non-daemon threads to end, one of which is depending on the JFrame being
-    // disposed to tell it when to end.
-    //
-    // If you're thinking 'hey, what about Minecraft.isCrashed?'
-    // No, that's only set if the internal MinecraftServer crashes.
-    // Otherwise the value is always false and threads spinning to check any such value
-    // will only serve to hang up the VM.
-    //
-    // But senpai, what about a warden thread joined on the main? I'm sure as soon as
-    // the main thread closes that would-
-    //
-    // Nope. It never runs.
-    //
-    // @forge
-    //  Because the minecraft forge team are stupid, they call displayCrashReport on startup
-    //  regardless of whether the game has crashed or not. Thus the window may flicker an additional
-    //  time as the native window is forced back to the front.
-    //  This is a minor issue as the window will simply reassert itself when it's next referenced
-    //  (i.e. The skins GUI uses it for file drops) so I have no intention of fixing this.
-    //
-    //  This is their problem.
-    //
-    //  Update 09/06/2018:
-    //     After inspecting the forge source this was found to be nothing but pure lies.
-    //     The only place they call it is from FMLClientHandler#haltGame.
-    //     There is still the possible case where another mod tries to call it,
-    //     but that would be the very definition of 'misbehaving'.
-    //
-    //     Also note that the method unconditionally calls System.exit, so anyone
-    //     who does will be having a hard time.
-    //
-    // @killjoy
-    //  Don't be afraid to use a mixin when the situation calls for it.
-    //  There is no other way to do this.
-    //
-    //  Do not remove.
-    //
-    //  [!!!DO NOT REMOVE!!!]
-    //
-    //  I'm serious, do not remove.
-    //  I don't care how much of a vendeta you have aginst mixins.
-    //
-    //public void displayCrashReport(CrashReport crashReportIn)
-    @Inject(method = "displayCrashReport(Lnet/minecraft/crash/CrashReport;)V", at = @At("HEAD"))
-    private void onGameCrash(CrashReport report, CallbackInfo info) {
-        GLWindow.dispose();
-    }
-}

src/hdskins/resources/hdskins.mixin.json

@@ -4,7 +4,6 @@
   "package": "com.voxelmodpack.hdskins.mixin",
   "refmap": "hdskins.mixin.refmap.json",
   "mixins": [
-    "MixinMinecraft",
     "MixinImageBufferDownload",
     "MixinPlayerInfo",
     "MixinSkullRenderer"