diff -r e15fbb37a405 -r 0631dfc0db07 lib/scripts/java-gui-setup
--- a/lib/scripts/java-gui-setup	Tue Jan 30 22:43:10 2024 +0100
+++ b/lib/scripts/java-gui-setup	Wed Jan 31 12:43:06 2024 +0100
@@ -2,10 +2,11 @@
 #
 # java-gui-setup --- platform-specific setup for Java/Swing GUI applications
 
-if [ "$ISABELLE_PLATFORM_FAMILY" = "macos" ]
-then
-  JAVA_VERSION="$("$ISABELLE_JDK_HOME/bin/java" -version 2>&1 | head -n 1 | cut -d '"' -f2)"
-  JAVA_DOMAIN="com.azul.zulu.${JAVA_VERSION}.java"
-  defaults read "$JAVA_DOMAIN" AppleWindowTabbingMode >/dev/null 2>/dev/null ||
-    defaults write "$JAVA_DOMAIN" AppleWindowTabbingMode manual >/dev/null 2>/dev/null
-fi
+case "$ISABELLE_PLATFORM_FAMILY" in
+  macos*)
+    JAVA_VERSION="$("$ISABELLE_JDK_HOME/bin/java" -version 2>&1 | head -n 1 | cut -d '"' -f2)"
+    JAVA_DOMAIN="com.azul.zulu.${JAVA_VERSION}.java"
+    defaults read "$JAVA_DOMAIN" AppleWindowTabbingMode >/dev/null 2>/dev/null ||
+      defaults write "$JAVA_DOMAIN" AppleWindowTabbingMode manual >/dev/null 2>/dev/null
+    ;;
+esac