feat: Improved inventory item selection

.idea/misc.xml

@@ -8,7 +8,7 @@
       </list>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_22" default="true" project-jdk-name="22" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_23" default="true" project-jdk-name="openjdk-23" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

src/main/java/cz/jzitnik/Main.java

@@ -12,7 +12,6 @@ import org.jline.terminal.TerminalBuilder;
 
 import java.io.IOException;
 
-
 public class Main {
     public static void main(String[] args) {
         try {

src/main/java/cz/jzitnik/game/ui/Inventory.java

@@ -317,7 +317,7 @@ public class Inventory {
         return selectedItemInv != -1;
     }
 
-    public void mergeItems(int indexFrom, int indexTo, Optional<InventoryItem[]> i) {
+    public boolean mergeItems(int indexFrom, int indexTo, Optional<InventoryItem[]> i) {
         InventoryDTO fromData = getItem(indexFrom, i);
         InventoryDTO toData = getItem(indexTo, i);
 
@@ -325,15 +325,15 @@ public class Inventory {
         InventoryItem toItem = toData.getObj()[toData.getIndex()];
 
         if (fromItem == null || toItem == null) {
-            return; // Nothing to merge
+            return false; // Nothing to merge
         }
 
         if (!fromItem.getItem().getFirst().isStackable() || !toItem.getItem().getFirst().isStackable()) {
-            return;
+            return false;
         }
 
         if (!fromItem.getItem().getFirst().equals(toItem.getItem().getFirst())) {
-            return; // Different items cannot be merged
+            return false; // Different items cannot be merged
         }
 
         while (true) {
@@ -351,6 +351,8 @@ public class Inventory {
         }
 
         selectedItemInv = -1;
+
+        return true;
     }
 
     public void mergeOne(int fromIndex, int toIndex, Optional<InventoryItem[]> i) {

src/main/java/cz/jzitnik/game/ui/InventoryClickHandler.java

@@ -91,6 +91,7 @@ public class InventoryClickHandler {
         int actualIndex = index + offset;
 
         if (inventory.getSelectedItemInv() == actualIndex) {
+            inventory.setSelectedItemInv(-1);
             return;
         }
 
@@ -101,7 +102,9 @@ public class InventoryClickHandler {
                 } else if (items[index] != null) {
                     if (inventory.hasSelectedItem()) {
                         // Merge items
-                        inventory.mergeItems(inventory.getSelectedItemInv(), actualIndex, i);
+                        if (!inventory.mergeItems(inventory.getSelectedItemInv(), actualIndex, i)) {
+                            inventory.setSelectedItemInv(index + offset);
+                        }
                     } else {
                         inventory.setSelectedItemInv(index + offset);
                     }