Release 1.5.6 (RPTools#777)

* Emergency fix for NPE on Mac OS (RPTools#765)

* Update Change Log for 1.5.6

Added notes for 1.5.6 release.

CHANGE_LOG.md

@@ -1,3 +1,13 @@
+Maptool 1.5.6
+=====
+Emergency fix for MacOS.  Otherwise the same as 1.5.5.
+
+Bug Fixes
+-----
+* [#763][i763] Fixed null-pointer exception thrown on launch for MacOS.
+
+[i763]: https://github.com/RPTools/maptool/issues/763
+
 Maptool 1.5.5
 =====
 Several contributors have brought us new features including a scroll bar added to the Select Map drop-down, audio macro functions, performance and UI improvements, and, of course, bug fixes.

src/main/java/net/rptools/maptool/client/tool/DefaultTool.java

@@ -14,15 +14,11 @@
  */
 package net.rptools.maptool.client.tool;
 
-import java.awt.Toolkit;
-import java.awt.event.MouseEvent;
-import java.awt.event.MouseListener;
-import java.awt.event.MouseMotionListener;
-import java.awt.event.MouseWheelEvent;
-import java.awt.event.MouseWheelListener;
+import java.awt.dnd.DragSource;
+import java.awt.event.*;
 import java.awt.geom.AffineTransform;
 import java.util.Set;
-import javax.swing.SwingUtilities;
+import javax.swing.*;
 import net.rptools.lib.swing.SwingUtil;
 import net.rptools.maptool.client.AppState;
 import net.rptools.maptool.client.AppUtil;
@@ -44,8 +40,7 @@ public abstract class DefaultTool extends Tool
   private boolean isDraggingMap;
   private int dragStartX;
   private int dragStartY;
-  private int dragThreshold =
-      (int) Toolkit.getDefaultToolkit().getDesktopProperty("DnD.gestureMotionThreshold");
+  private int dragThreshold = DragSource.getDragThreshold();
 
   protected int mouseX;
   protected int mouseY;