Unstable 1.1.14.0

Barotrauma/BarotraumaShared/SharedSource/Characters/Talents/TalentTree.cs

@@ -133,6 +133,14 @@ namespace Barotrauma
 
             if (IsTalentLocked(talentIdentifier)) { return false; }
 
+            if (character.Info.GetUnlockedTalentsInTree().Contains(talentIdentifier))
+            {
+                //if the character already has the talent, it must be viable?
+                //needed for backwards compatibility, otherwise if we remove e.g. a tier 1 or tier 2 talent,
+                //all the already-unlocked higher-tier talents will be considered invalid which'll break the talent selection
+                return true;
+            }
+
             foreach (var subTree in talentTree!.TalentSubTrees)
             {
                 if (subTree.AllTalentIdentifiers.Contains(talentIdentifier) && subTree.HasMaxTalents(selectedTalents)) { return false; }
@@ -143,11 +151,12 @@ namespace Barotrauma
                     {
                         return !talentOptionStage.HasMaxTalents(selectedTalents) && TalentTreeMeetsRequirements(talentTree, subTree, selectedTalents);
                     }
+                    //if a previous stage hasn't been completed, this talent can't be selected yet
                     bool optionStageCompleted = talentOptionStage.HasEnoughTalents(selectedTalents);
                     if (!optionStageCompleted)
                     {
                         break;
-                    }
+                    }                    
                 }
             }