No new line break for some at-sign@ in Javadoc comment

[cindy-peng]

We have a string as:

// AUTO-GENERATED DOCUMENTATION AND METHOD.
/**
* <p> Sample code:
* <pre>{@code
* // This snippet has been automatically generated and should be regarded as a code template only.
* try (EchoServiceClient echoServiceClient =
*     EchoServiceClient.create()) {
*   EchoResponse response =
*       echoServiceClient.chat();
* }
* }</pre>
* @param request The request object containing all of the parameters for the API call.
* @throws com.google.api.gax.rpc.ApiException if the remote call fails
* @InternalApi This method is internal used only. Please do not use directly.
*/

After running java-format on the above string, the Javadoc comment gets reformatted as:

// AUTO-GENERATED DOCUMENTATION AND METHOD.
  /**
   * Sample code:
   *
   * <pre>{@code
   * // This snippet has been automatically generated and should be regarded as a code template only.
   * try (EchoServiceClient echoServiceClient =
   *     EchoServiceClient.create()) {
   *   EchoResponse response =
   *       echoServiceClient.chat();
   * }
   * }</pre>
   *
   * @param request The request object containing all of the parameters for the API call.
   * @throws com.google.api.gax.rpc.ApiException if the remote call fails @InternalApi This method
   *     is internal used only. Please do not use directly.
   */

Notice the line break before @InternalApi was removed and a line break was added after @InternalApi This method. This makes the method comments hard to read.
Could you please help investigate?
Thank you!

[tbroyer]

Your custom @InternalApi tag is treated like an unescaped annotation by Google Java Format. If you can make it start with a lowercase, it would consider it as a tag:

google-java-format/core/src/main/java/com/google/googlejavaformat/java/javadoc/JavadocLexer.java

Lines 524 to 528 in 96f114c

	// We ensure elsewhere that we match this only at the beginning of a line.
	// Only match tags that start with a lowercase letter, to avoid false matches on unescaped
	// annotations inside code blocks.
	// Match "@param <T>" specially in case the <T> is a <P> or other HTML tag we treat specially.
	private static final Pattern FOOTER_TAG_PATTERN = compile("^@(param\\s+<\\w+>|[a-z]\\w*)");