forms designer re-ordering components dragging gone weird
### Apache NetBeans version

Apache NetBeans 18

### What happened

Dragging not smooth

### How to reproduce

(*) Open Netbeans form designer on a complex form

(*) open the Object navigator

(*) try and drag an item up or down 

(*) Notice that the insertion point is not following the drag point properly, but bouncing around

### Did this work correctly in an earlier version?

Apache NetBeans 17

### Operating System

Windows 10 version 10.0 running on amd64; Cp1252; en_US (nb)

### JDK

17.0.5; OpenJDK 64-Bit Server VM 17.0.5+8

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No
diff --git a/ide/spi.palette/src/org/netbeans/modules/palette/ui/DnDSupport.java b/ide/spi.palette/src/org/netbeans/modules/palette/ui/DnDSupport.java
index 808e428799..fcfc718b11 100644
--- a/ide/spi.palette/src/org/netbeans/modules/palette/ui/DnDSupport.java
+++ b/ide/spi.palette/src/org/netbeans/modules/palette/ui/DnDSupport.java
@@ -280,8 +280,8 @@ public class DnDSupport  implements DragGestureListener, DropTargetListener {
                 p1.y += target.getHeight();
                 p2.y += target.getHeight();
             }
-            p1 = SwingUtilities.convertPoint( target, p1, palette.getRootPane() );
-            p2 = SwingUtilities.convertPoint( target, p2, palette.getRootPane() );
+            p1 = SwingUtilities.convertPoint( target, p1, dropPane );
+            p2 = SwingUtilities.convertPoint( target, p2, dropPane );
             Line2D line = new Line2D.Double( p1.x, p1.y, p2.x, p2.y );
             dropPane.setDropLine( line );
         } else {
@@ -411,8 +411,8 @@ public class DnDSupport  implements DragGestureListener, DropTargetListener {
                 p2.y += rect.height;
             }
         }
-        p1 = SwingUtilities.convertPoint( list, p1, palette.getRootPane() );
-        p2 = SwingUtilities.convertPoint( list, p2, palette.getRootPane() );
+        p1 = SwingUtilities.convertPoint( list, p1, dropPane );
+        p2 = SwingUtilities.convertPoint( list, p2, dropPane );
         Line2D line = new Line2D.Double( p1.x, p1.y, p2.x, p2.y );
         dropPane.setDropLine( line );
         targetItem = (Item)list.getModel().getElementAt( dropIndex );
diff --git a/platform/openide.explorer/src/org/openide/explorer/view/OutlineViewDropSupport.java b/platform/openide.explorer/src/org/openide/explorer/view/OutlineViewDropSupport.java
index 0d0732d544..a0867ffb45 100644
--- a/platform/openide.explorer/src/org/openide/explorer/view/OutlineViewDropSupport.java
+++ b/platform/openide.explorer/src/org/openide/explorer/view/OutlineViewDropSupport.java
@@ -34,7 +34,6 @@ import java.awt.dnd.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.geom.Line2D;
-import java.awt.geom.Line2D.Double;
 
 import java.util.Arrays;
 import java.util.Comparator;
@@ -290,14 +289,14 @@ final class OutlineViewDropSupport implements DropTargetListener, Runnable {
         } else {
             // line and selection of parent if any
             if (pointAt == DragDropUtilities.NODE_UP) {
-                Line2D line = new Double( 0, nodeArea.y, table.getWidth(), nodeArea.y );
+                Line2D line = new Line2D.Double( 0, nodeArea.y, table.getWidth(), nodeArea.y );
                 convertBoundsAndSetDropLine(line);
 
                 // enlagre node area with area for line
                 Rectangle lineArea = new Rectangle( 0, nodeArea.y - 5, table.getWidth(), 10 );
                 nodeArea = (Rectangle) nodeArea.createUnion(lineArea);
             } else {
-                Line2D line = new Double( 0, nodeArea.y + nodeArea.height, table.getWidth(), nodeArea.y + nodeArea.height );
+                Line2D line = new Line2D.Double( 0, nodeArea.y + nodeArea.height, table.getWidth(), nodeArea.y + nodeArea.height );
                 convertBoundsAndSetDropLine(line);
 
                 // enlagre node area with area for line
@@ -340,16 +339,16 @@ final class OutlineViewDropSupport implements DropTargetListener, Runnable {
         view.repaint(r.x - 5, r.y - 5, r.width + 10, r.height + 10);
     }
 
-    /** Converts line's bounds by the bounds of the root pane. Drop glass pane
-     * is over this root pane. After covert a given line is set to drop glass pane.
+    /** Converts line's bounds by the bounds of the drop glass pane.
+     * After covert a given line is set to drop glass pane.
      * @param line line for show in drop glass pane */
     private void convertBoundsAndSetDropLine(final Line2D line) {
         int x1 = (int) line.getX1();
         int x2 = (int) line.getX2();
         int y1 = (int) line.getY1();
         int y2 = (int) line.getY2();
-        Point p1 = SwingUtilities.convertPoint(table, x1, y1, table.getRootPane());
-        Point p2 = SwingUtilities.convertPoint(table, x2, y2, table.getRootPane());
+        Point p1 = SwingUtilities.convertPoint(table, x1, y1, dropPane);
+        Point p2 = SwingUtilities.convertPoint(table, x2, y2, dropPane);
         line.setLine(p1, p2);
         dropPane.setDropLine(line);
     }
diff --git a/platform/openide.explorer/src/org/openide/explorer/view/TreeViewDropSupport.java b/platform/openide.explorer/src/org/openide/explorer/view/TreeViewDropSupport.java
index d4a0e30bce..0462e61c66 100644
--- a/platform/openide.explorer/src/org/openide/explorer/view/TreeViewDropSupport.java
+++ b/platform/openide.explorer/src/org/openide/explorer/view/TreeViewDropSupport.java
@@ -33,7 +33,6 @@ import java.awt.dnd.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.geom.Line2D;
-import java.awt.geom.Line2D.Double;
 import java.util.ArrayList;
 
 import java.util.Arrays;
@@ -285,7 +284,7 @@ final class TreeViewDropSupport implements DropTargetListener, Runnable {
         } else {
             // line and selection of parent if any
             if (pointAt == DragDropUtilities.NODE_UP) {
-                Line2D line = new Double(
+                Line2D line = new Line2D.Double(
                         nodeArea.x - SHIFT_LEFT, nodeArea.y + SHIFT_DOWN, endPointX, nodeArea.y + SHIFT_DOWN
                     );
                 convertBoundsAndSetDropLine(line);
@@ -296,7 +295,7 @@ final class TreeViewDropSupport implements DropTargetListener, Runnable {
                     );
                 nodeArea = (Rectangle) nodeArea.createUnion(lineArea);
             } else {
-                Line2D line = new Double(
+                Line2D line = new Line2D.Double(
                         nodeArea.x - SHIFT_LEFT, nodeArea.y + nodeArea.height + SHIFT_DOWN, endPointX,
                         nodeArea.y + nodeArea.height + SHIFT_DOWN
                     );
@@ -359,19 +358,21 @@ final class TreeViewDropSupport implements DropTargetListener, Runnable {
         tree.repaint(r.x - 5, r.y - 5, r.width + 10, r.height + 10);
     }
 
-    /** Converts line's bounds by the bounds of the root pane. Drop glass pane
-     * is over this root pane. After covert a given line is set to drop glass pane.
+    /** Converts line's bounds by the bounds of the drop glass pane.
+     * After covert a given line is set to drop glass pane.
      * @param line line for show in drop glass pane */
     private void convertBoundsAndSetDropLine(final Line2D line) {
+        if (dropPane == null)
+            return;
+
         int x1 = (int) line.getX1();
         int x2 = (int) line.getX2();
         int y1 = (int) line.getY1();
         int y2 = (int) line.getY2();
-        Point p1 = SwingUtilities.convertPoint(tree, x1, y1, tree.getRootPane());
-        Point p2 = SwingUtilities.convertPoint(tree, x2, y2, tree.getRootPane());
+        Point p1 = SwingUtilities.convertPoint(tree, x1, y1, dropPane);
+        Point p2 = SwingUtilities.convertPoint(tree, x2, y2, dropPane);
         line.setLine(p1, p2);
-        if( null != dropPane )
-            dropPane.setDropLine(line);
+        dropPane.setDropLine(line);
     }
 
     /** Removes timer and all listeners. */
['platform/openide.explorer/src/org/openide/explorer/view/OutlineViewDropSupport.java', 'ide/spi.palette/src/org/netbeans/modules/palette/ui/DnDSupport.java', 'platform/openide.explorer/src/org/openide/explorer/view/TreeViewDropSupport.java']