String wrapping is not idempotent

Reproduisez le problème avec l’exemple TestFormat.java fourni en utilisant le JAR all-deps de google-java-format 1.15.0 ou 1.16.0 sur Java 17. Exécutez le formatage à plusieurs reprises et comparez la disposition de la chaîne de switch-expression après chaque passage. C’est terminé lorsque le formatage du fichier inchangé produit une sortie identique à chaque exécution suivante.

This happened with the all deps jar from github, for both versions 1.15.0 and 1.16.0.

$ java --version
openjdk 17.0.6 2023-01-17
OpenJDK Runtime Environment (build 17.0.6+10)
OpenJDK 64-Bit Server VM (build 17.0.6+10, mixed mode)

Example code is

package com.example;

public class TestFormat {

  public void main() {
    var value = 1;
    var responseMessage =
        switch (value) {
          case 1 -> "This is a long string;This is a long string;This is a long string;This is a long string;This is a long string;This is a long string;This is a long string;";
          case 2 -> "some short string";
          case 3 -> "some medium string some medium string some medium string some medium string";
        };
  }
}

Now these strings in the switch statement will be different formatted depending on how often I call google java format.
Weirdly enough, the cosium maven plugin (gjf v1.15.0) does not change the strings in this example at all. This would be preferable for me, but mostly I want a consistent format.

## executing preview only
$ java -jar /home/dev/dev/libs/google-java-format-1.15.0-all-deps.jar Testformat.java 
package com.example;

public class TestFormat {

  public void main() {
    var value = 1;
    var responseMessage =
        switch (value) {
          case 1 -> "This is a long string;This is a long string;This is a long string;This is a"
                        + " long string;This is a long string;This is a long string;This is a long"
                        + " string;";
          case 2 -> "some short string";
          case 3 -> "some medium string some medium string some medium string some medium string";
        };
  }
}

## applying changes
$ java -jar /home/dev/dev/libs/google-java-format-1.15.0-all-deps.jar -r Testformat.java 

## executing preview only
$ java -jar /home/dev/dev/libs/google-java-format-1.15.0-all-deps.jar Testformat.java
package com.example;

public class TestFormat {

  public void main() {
    var value = 1;
    var responseMessage =
        switch (value) {
          case 1 -> "This is a long string;This is a long string;This is a long string;This is a"
              + " long string;This is a long string;This is a long string;This is a long"
              + " string;";
          case 2 -> "some short string";
          case 3 -> "some medium string some medium string some medium string some medium string";
        };
  }
}

The expectation would be that once I format a file every future format call would not change anything anymore as long as nothing was changed on the file.