From bba9a36996208be6953c12f9747e962c65155ba6 Mon Sep 17 00:00:00 2001
From: Sollace <sollacea@gmail.com>
Date: Sat, 20 Oct 2018 12:19:56 +0200
Subject: [PATCH] Fixed delay/thread locking when setting the file drop target

---
 .../com/voxelmodpack/hdskins/upload/GLWindow.java  | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/hdskins/java/com/voxelmodpack/hdskins/upload/GLWindow.java b/src/hdskins/java/com/voxelmodpack/hdskins/upload/GLWindow.java
index 63095f41..e903dffb 100644
--- a/src/hdskins/java/com/voxelmodpack/hdskins/upload/GLWindow.java
+++ b/src/hdskins/java/com/voxelmodpack/hdskins/upload/GLWindow.java
@@ -74,7 +74,7 @@ public class GLWindow extends DropTarget {
     private JFrame frame;
     private Canvas canvas;
 
-    private DropTargetListener dropListener = null;
+    private volatile DropTargetListener dropListener = null;
 
     private int windowState = 0;
 
@@ -241,21 +241,29 @@ public class GLWindow extends DropTarget {
     }
 
     public synchronized void clearDropTargetListener() {
+        SwingUtilities.invokeLater(this::syncClearDropTargetListener);
+    }
+
+    private void syncClearDropTargetListener() {
         if (dropListener != null) {
             if (!ready) {
                 FileDropper.getAWTContext().hide(dropListener);
-                return;
             } else {
                 frame.setDropTarget(null);
                 removeDropTargetListener(dropListener);
             }
+
             dropListener = null;
         }
     }
 
     public synchronized void setDropTargetListener(FileDropListener dtl) {
+        SwingUtilities.invokeLater(() -> syncSetDropTargetListener(dtl));
+    }
+
+    private void syncSetDropTargetListener(FileDropListener dtl) {
         try {
-            clearDropTargetListener();
+            syncClearDropTargetListener();
 
             dropListener = dtl;