Use API version 1.21.3, fix invsee

src/main/java/de/shiewk/smoderation/paper/command/InvseeCommand.java

@@ -5,6 +5,7 @@ import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.brigadier.tree.LiteralCommandNode;
 import de.shiewk.smoderation.paper.inventory.InvSeeEquipmentInventory;
+import de.shiewk.smoderation.paper.inventory.InvSeeInventory;
 import de.shiewk.smoderation.paper.util.CommandUtil;
 import io.papermc.paper.command.brigadier.CommandSourceStack;
 import io.papermc.paper.command.brigadier.argument.ArgumentTypes;
@@ -50,7 +51,7 @@ public final class InvseeCommand implements CommandProvider {
                         .append(target.teamDisplayName().colorIfAbsent(SECONDARY_COLOR))
                         .append(text("."))
         ));
-        sender.openInventory(target.getInventory());
+        new InvSeeInventory(sender, target).open();
         return Command.SINGLE_SUCCESS;
     }
 

src/main/java/de/shiewk/smoderation/paper/inventory/InvSeeInventory.java

@@ -0,0 +1,69 @@
+package de.shiewk.smoderation.paper.inventory;
+
+import de.shiewk.smoderation.paper.SModerationPaper;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.inventory.InventoryClickEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+import static net.kyori.adventure.text.Component.text;
+
+public class InvSeeInventory implements AutoUpdatingCustomInventory {
+    private final HumanEntity viewer;
+    private final HumanEntity subject;
+    private final Inventory subjectInventory;
+    private final Inventory inventory;
+    private boolean changing = false;
+
+    public InvSeeInventory(HumanEntity viewer, HumanEntity subject) {
+        this.viewer = viewer;
+        this.subject = subject;
+        this.subjectInventory = subject.getInventory();
+        this.inventory = Bukkit.createInventory(this, 36, text("Player inventory"));
+    }
+
+
+    @Override
+    public void refresh() {
+        if (!changing){
+            loadContents();
+        }
+    }
+
+    private void loadContents() {
+        for (int i = 0; i < inventory.getSize(); i++) {
+            inventory.setItem(i, subjectInventory.getItem(i));
+        }
+    }
+
+    @Override
+    public void open() {
+        refresh();
+        viewer.openInventory(getInventory());
+    }
+
+    @Override
+    public void click(ItemStack stack, InventoryClickEvent event) {
+        if (viewer.hasPermission("smod.invsee.modify") && !subject.hasPermission("smod.invsee.preventmodify")){
+            event.setCancelled(false);
+            changing = true;
+            Bukkit.getScheduler().scheduleSyncDelayedTask(SModerationPaper.PLUGIN, () -> {
+                changing = false;
+                applyChanges();
+            });
+        }
+    }
+
+    private void applyChanges() {
+        for (int i = 0; i < inventory.getSize(); i++) {
+            subjectInventory.setItem(i, inventory.getItem(i));
+        }
+    }
+
+    @Override
+    public @NotNull Inventory getInventory() {
+        return inventory;
+    }
+}

src/main/java/de/shiewk/smoderation/paper/inventory/SModMenu.java

@@ -9,6 +9,7 @@ import de.shiewk.smoderation.paper.punishments.PunishmentType;
 import de.shiewk.smoderation.paper.storage.PunishmentContainer;
 import de.shiewk.smoderation.paper.util.PlayerUtil;
 import de.shiewk.smoderation.paper.util.TimeUtil;
+import io.papermc.paper.datacomponent.DataComponentTypes;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;
 import net.kyori.adventure.text.format.NamedTextColor;
@@ -20,7 +21,6 @@ import org.bukkit.Sound;
 import org.bukkit.entity.Player;
 import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.inventory.Inventory;
-import org.bukkit.inventory.ItemFlag;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.inventory.meta.SkullMeta;
@@ -257,7 +257,7 @@ public class SModMenu extends PageableCustomInventory {
     private ItemStack createSearchItem(){
         final ItemStack stack = new ItemStack(Material.FLOWER_BANNER_PATTERN);
         stack.editMeta(meta -> {
-            meta.addItemFlags(ItemFlag.HIDE_ITEM_SPECIFICS);
+            stack.setData(DataComponentTypes.HIDE_ADDITIONAL_TOOLTIP);
             meta.displayName(applyFormatting(text("Search").color(PRIMARY_COLOR)));
             final ArrayList<Component> lore = new ArrayList<>(List.of(
                     Component.empty(),

src/main/resources/plugin.yml

@@ -1,7 +1,7 @@
 name: SModeration
 version: '${version}'
 main: de.shiewk.smoderation.paper.SModerationPaper
-api-version: '1.21'
+api-version: '1.21.3'
 load: STARTUP
 authors:
   - Shiewk