fix interface dropping stacks over the stack limit. fix potential dupes

fixes #328

gradle.properties

@@ -39,7 +39,7 @@ modId=appliedenergistics2
 modGroup=appeng
 # Version of your mod.
 # This field can be left empty if you want your mod's version to be determined by the latest git tag instead.
-modVersion=rv6-stable-7-extended_life-v0.55.26
+modVersion=rv6-stable-7-extended_life-v0.55.29
 # Whether to use the old jar naming structure (modid-mcversion-version) instead of the new version (modid-version)
 includeMCVersionJar=false
 # The name of your jar when you produce builds, not including any versioning info

src/main/java/appeng/helpers/DualityInterface.java

@@ -1203,6 +1203,13 @@ public class DualityInterface implements IGridTickable, IStorageMonitorable, IIn
 
         for (final ItemStack is : this.storage) {
             if (!is.isEmpty()) {
+                int maxStackSize = is.getMaxStackSize();
+                while (is.getCount() > maxStackSize) {
+                    ItemStack portionedStack = is.copy();
+                    portionedStack.setCount(maxStackSize);
+                    is.shrink(maxStackSize);
+                    drops.add(portionedStack);
+                }
                 drops.add(is);
             }
         }