unused import removal leaves extra blank line between package declaration and class Javadoc / declaration

まず、TestBug.java の例と google-java-format コマンドを使って問題を再現します。未使用の import を削除し、パッケージ宣言とクラスの Javadoc の間の垂直方向の空白を処理するフォーマットパスを追跡します。最初のフォーマットパスで期待される出力と一致する空行が 1 行生成され、2 回目のパスが不要になれば完了です。

When google-java-format removes an unused import statement located between a package declaration and class Javadoc or class declaration, it does not collapse the vertical whitespace in the same formatting pass. As a result, the formatted output contains extra blank lines (two consecutive blank lines instead of one).

Running google-java-format a second time on the output collapses the extra blank line as expected. We observed this in generated code, more context here: https://github.com/googleapis/librarian/issues/7146

Environment

• google-java-format Version: Tested on 1.25.2 through 1.35.0 (including recent builds).
• Operating System: Linux / macOS / Cross-platform

Minimal Reproducible Example

Input Code (TestBug.java)

```java                                                                                                                                                                                 
package com.example;                                                                                                                                                                    

import static io.grpc.MethodDescriptor.generateFullMethodName;

/**
 * Javadoc for class.
 */
public class TestBug {
}

Command Executed

google-java-format TestBug.java

Actual Output (First Pass)

package com.example;


/** Javadoc for class. */
public class TestBug {}

(Notice the two consecutive empty lines between package com.example; and /** Javadoc for class. */.)

Expected Output

package com.example;

/** Javadoc for class. */
public class TestBug {}

Additional Context & Workaround

• Second Pass Result: Executing google-java-format a second time on the first pass output (google-java-format TestBug.java | google-java-format -) produces the correct output with a single blank line.