From fb4b5b25750261c4d5b2e6853b5a897eebea96d1 Mon Sep 17 00:00:00 2001
From: Ari Vuollet <ari.vuollet@goat.moe>
Date: Tue, 7 Jan 2025 17:53:37 +0200
Subject: [PATCH] Allow window with single tab to be dragged from tab area

---
 Source/Editor/GUI/Docking/DockPanelProxy.cs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/Source/Editor/GUI/Docking/DockPanelProxy.cs b/Source/Editor/GUI/Docking/DockPanelProxy.cs
index dbb4e082e..62733ac1e 100644
--- a/Source/Editor/GUI/Docking/DockPanelProxy.cs
+++ b/Source/Editor/GUI/Docking/DockPanelProxy.cs
@@ -49,6 +49,11 @@ namespace FlaxEditor.GUI.Docking
         /// The mouse position.
         /// </summary>
         public Float2 MousePosition = Float2.Minimum;
+        
+        /// <summary>
+        /// The mouse position.
+        /// </summary>
+        public Float2 MouseStartPosition = Float2.Minimum;
 
         /// <summary>
         /// The start drag asynchronous window.
@@ -355,6 +360,7 @@ namespace FlaxEditor.GUI.Docking
             if (IsSingleFloatingWindow)
                 return base.OnMouseDown(location, button);
             MouseDownWindow = GetTabAtPos(location, out IsMouseDownOverCross);
+            MouseStartPosition = location;
 
             // Check buttons
             if (button == MouseButton.Left)
@@ -441,6 +447,20 @@ namespace FlaxEditor.GUI.Docking
                         StartDrag(MouseDownWindow);
                     MouseDownWindow = null;
                 }
+                // Check if single tab is tried to be moved
+                else if (MouseDownWindow != null && _panel.TabsCount <= 1)
+                {
+                    if ((MousePosition - MouseStartPosition).Length > 3)
+                    {
+                        // Clear flag
+                        IsMouseLeftButtonDown = false;
+
+                        // Check tab under the mouse
+                        if (!IsMouseDownOverCross && MouseDownWindow != null)
+                            StartDrag(MouseDownWindow);
+                        MouseDownWindow = null;
+                    }
+                }
                 // Check if has more than one tab to change order
                 else if (MouseDownWindow != null && _panel.TabsCount > 1)
                 {