google / google/google-java-format

not idempotent, slow convergence, and bad converged result

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描述

Tested release 1.15.0 with the following

```
public class Foo {

private static final String foo =
"\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\","
+ "\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\","
+ "\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\","
+ "\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\","
+ "\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"aaaaaaaaaaaaaaaaaaaaa\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"\n";
}
```

google-java-format would join the last two lines of string and make the last line even longer. Continue invoking google-java-format would keep joining the last part until the whole string is on a single line.

Workaround:
1. remove the last `\n` stops this behavior
2. make the last line shorter than 100 chars stops this behavior

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