Initialize only if null but always fill expression of lambda

Author: nkoester

.gitignore

@@ -29,6 +29,7 @@ cell-screenshots/
 # -----------------------------------------------------------
 .idea
 workspace.xml
+.ideaconfig
 
 # -----------------------------------------------------------
 # JUNIT
@@ -52,6 +53,7 @@ code/languages/*/TEST*.xml
 code/languages/org.iets3.core/build/tmp
 .mps-caches
 *.iml
+.mpsconfig
 
 # -----------------------------------------------------------
 # GRADLE

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project are documented in this file.
 Format of the log is _loosely_ based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 The project does _not_ follow Semantic Versioning and the changes are documented in reverse chronological order, grouped by calendar month.
 
+## July 2025
+
+### Fixed
+
+- Expressions of ShortLambdas are now correctly updated and used for interpretation after they are changed
+
 ## May 2025
 
 ### Fixed