Camera Fade needs to be cleared before called

Fixes stack overflow recusion bug when fades are called in a cascading/overlapping fashion.

Assets/Fungus/Docs/CHANGELOG.txt

@@ -8,8 +8,9 @@ Unreleased
  - Fix double duplication of blocks in flowchart window. Thanks to ongjinwen.
  - Dialog ClickAnywhere not supports ignore click delay. Thanks to breadnone.
  - SetNextLineFlag only flags if Dialog is actually active/writing. Thanks to breadnone. 
- - TextAdapter with TMPro, now forces mesh update on text change. Fixes cases where a Say/Writer would expect RevealedCharacters to be current but would be previous frame stale value.  
+ - TextAdapter with TMPro, now forces mesh update on text change. Fixes cases where a Say/Writer would expect RevealedCharacters to be current but would be previous frame stale value.
- 
+ - Camera Fade clears local callback before execution, fixes #973.
+
 ## Changed
  - Block will LogError when an exception is caught from a Command being Executed.
  - WriterAudio.GetSecondsRemaining reports 0 if not playing. Thanks to KVinS.

Assets/Fungus/Scripts/Components/CameraManager.cs

@@ -230,8 +230,9 @@ namespace Fungus
                     .setOnComplete(() =>
                     {
                         fadeAlpha = targetAlpha;
-                        if (fadeAction != null) fadeAction();
+                        var tempFadeActin = fadeAction;
-                        fadeTween = null;
+                        fadeAction = null;
+                        if (tempFadeActin != null) tempFadeActin();
                     });
             }
         }

Assets/Tests/Overlapping_Flash.unity

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