class selection now redirects you to the subclass you took last time. this does not work well with subclass nets yet but does delete data randomly at least

src/main/java/net/Indyuce/mmocore/api/player/profess/PlayerClass.java

@@ -267,6 +267,20 @@ public class PlayerClass extends PostLoadObject {
         return subclasses;
     }
 
+    /**
+     * Recursive method which checks if the given class
+     * is a child of the current class in the 'subclass tree'.
+     *
+     * @param profess Some player class
+     * @return If given class is a subclass of the current class
+     */
+    public boolean hasSubclass(PlayerClass profess) {
+        for (Subclass sub : subclasses)
+            if (sub.getProfess().equals(profess) || sub.getProfess().hasSubclass(profess))
+                return true;
+        return false;
+    }
+
     public boolean hasSkill(Skill skill) {
         return hasSkill(skill.getId());
     }

src/main/java/net/Indyuce/mmocore/gui/ClassSelect.java

@@ -121,8 +121,33 @@ public class ClassSelect extends EditableInventory {
 					return;
 				}
 
-				InventoryManager.CLASS_CONFIRM.newInventory(playerData, profess, this).open();
+				InventoryManager.CLASS_CONFIRM.newInventory(playerData, findDeepestSubclass(playerData, profess), this).open();
 			}
 		}
 	}
+
+	/**
+	 * When switching from a class where you had progress before,
+	 * you should be instantly redirected to the highest subclass
+	 * in the subclass tree that you chose, because your progress
+	 * is saved there.
+	 * <p>
+	 * It's also more RPG style to take the player back to the subclass
+	 * he chose because that way he can't turn back and chose another path.
+	 *
+	 * This does NOT function properly with subclass nets yet.
+	 *
+	 * @param root The root class, it's called the root because since the
+	 *             player was able to choose it in the class GUI, it should
+	 *             be at the bottom of the class tree.
+	 */
+	private PlayerClass findDeepestSubclass(PlayerData player, PlayerClass root) {
+		for (String checkedName : player.getSavedClasses()) {
+			PlayerClass checked = MMOCore.plugin.classManager.getOrThrow(checkedName);
+			if (root.hasSubclass(checked))
+				return checked;
+		}
+
+		return root;
+	}
 }