Krypton-Suite · PWagner1 · Feb 4, 2026 · Feb 3, 2026
@@ -4,6 +4,7 @@
 
 ## 2026-04-20 - Build 2604 (Version 105-LTS - Patch 2) - April 2026
 
+* Resolved [#2132](https://github.com/Krypton-Suite/Standard-Toolkit/issues/2132), Drag feedback artifact: when dragging a dockable page, a small dark artefact appeared in the top-left corner of the screen. The drop feedback window (`DropSolidWindow`) was created at (0,0); it is now positioned off-screen initially and when no drop target is matched.
 * Implemented [#2952](https://github.com/Krypton-Suite/Standard-Toolkit/issues/2962), Set license header via `editorconfig`
 * Resolved [#2935](https://github.com/Krypton-Suite/Standard-Toolkit/issues/2935), Maximized MDI window form border drawn on wrong monitor (secondary monitor); `DropSolidWindow` now uses screen coordinates for `DesktopBounds`; non-client border painting uses a DC compatible with the window's monitor
 * Resolved [#2103](https://github.com/Krypton-Suite/Standard-Toolkit/issues/2103), Ensure that `KryptonForm` properly supports RTL/LTR

@@ -223,8 +223,9 @@ public override void Start(IPaletteDragDrop paletteDragDrop,
             if (_solid == null)
             {
                 // Create and show a solid feedback window without it taking focus
+                // Position off-screen initially to avoid a visible 1x1 artifact at top-left (0,0).
                 _solid = new DropSolidWindow(PaletteDragDrop, Renderer);
-                _solid.SetBounds(0, 0, 1, 1, BoundsSpecified.All);
+                _solid.SetBounds(GlobalStaticValues.OFF_SCREEN_POSITION, GlobalStaticValues.OFF_SCREEN_POSITION, 1, 1, BoundsSpecified.All);
                 _solid.ShowWithoutActivate();
                 _solid.Refresh();
             }

@@ -57,7 +57,9 @@ public override void Start(IPaletteDragDrop paletteDragDrop,
         {
             // Create and show a window without it taking focus
             _solid = new DropSolidWindow(PaletteDragDrop, Renderer);
-            _solid.SetBounds(0, 0, 1, 1, BoundsSpecified.All);
+
+            // Position off-screen initially to avoid a visible 1x1 artifact at top-left (0,0).
+            _solid.SetBounds(GlobalStaticValues.OFF_SCREEN_POSITION , GlobalStaticValues.OFF_SCREEN_POSITION, 1, 1, BoundsSpecified.All);
             _solid.ShowWithoutActivate();
             _solid.Refresh();
         }

@@ -81,9 +81,19 @@ public Rectangle SolidRect
             {
                 _solidRect = value;
 
-                var area = Screen.GetWorkingArea(this);
-
-                var bounds = new Rectangle(value.Location - (Size)area.Location, value.Size);
+                Rectangle bounds;
+
+                if (value.IsEmpty)
+                {
+                    // Move off-screen to avoid a visible artifact at (0,0) when no target is matched
+                    bounds = new Rectangle(GlobalStaticValues.OFF_SCREEN_POSITION, GlobalStaticValues.OFF_SCREEN_POSITION, 0, 0);
+                }
+                else
+                {
+                    var area = Screen.GetWorkingArea(this);
+
+                    bounds = new Rectangle(value.Location - (Size)area.Location, value.Size);
+                } 
 
                 DesktopBounds = bounds;
 

@@ -56,6 +56,9 @@ public class GlobalStaticValues
 
     internal const int DEFAULT_PADDING = 10;
 
+    /// <summary>Windows convention for positioning windows off-screen (e.g. to hide them). Used when placing windows so they are not visible.</summary>
+    public const int OFF_SCREEN_POSITION = -32000;
+
     /// <summary>The global default theme index</summary>
     public const int GLOBAL_DEFAULT_THEME_INDEX = (int)PaletteMode.Microsoft365Blue;