Allow different cutscenes to play at the same time

Author: maddie480

Celeste.Mod.mm/Mod/Entities/DialogCutscene.cs

@@ -2,6 +2,7 @@
 using System.Collections;
 
 namespace Celeste.Mod.Entities {
+    [Tracked]
     public class DialogCutscene : CutsceneEntity {
 
         private Player player;
@@ -45,5 +46,12 @@ public override void OnEnd(Level level) {
             }
         }
 
+        public static bool IsInProgress(string dialogID) {
+            foreach (DialogCutscene dialogCutscene in Engine.Scene.Tracker.GetEntities<DialogCutscene>()) {
+                if (dialogCutscene.dialogID == dialogID) return true;
+            }
+            return false;
+        }
+
     }
 }

Celeste.Mod.mm/Mod/Entities/DialogCutsceneTrigger.cs

@@ -58,8 +58,8 @@ private void TriggerCutscene(Player player) {
             if (ignoreIntroState && ((patch_Player) player).IsIntroState)
                 return;
 
-            // don't activate if some dialog is already in progress
-            if (level.Tracker.GetEntity<Textbox>() is not null)
+            // don't activate if the same dialog is already in progress
+            if (DialogCutscene.IsInProgress(dialogEntry))
                 return;
 
             triggered = true;