Not clear why this code is not violation
But
https://checkstyle-diff-reports.s3.us-east-2.amazonaws.com/36741ab4af1ebf03d8c57f55ef343c029282f294_2026230430/reports/diff/openjdk25/index.html#A5 is still violation.

Please explain

both snippets go through the same LineWrappingHandler path; the difference is the config: the test uses forceStrictCondition=false, so it only flags when indent is below expected, and column 46 is ≥ 8 so no violation. The OpenJDK diff uses forceStrictCondition=true, which i guess requires exact alignment, so column 46 becomes a violation.

Please create new input with such property as true, copy jdk code snippet in it.
Let's see what is going on.

Something strange, it use to be violation on 'try' now it is on '@'.
forceStrictCondition=true only applied to line wrapping, not sure how it becomes here involved

Something strange, it use to be violation on 'try' now it is on '@'.

i think that comes down to the fact that checkstyle report one violation per line .before the fix #A4 (the try child violation) was reported first, which claimed line 643,That prevented #A5 (the @ violation) from being reported , After our fix, #A4 is correctly removed ( the false positive). But now line 643 is never claimed by TryHandler, so LineWrappingHandler freely reports #A5, which was always there, just previously masked.

i previously runned the all jar on this

import java.awt.Component;

public class Test {
    // Thread-safe Object.equals() called from native
    public static boolean doEquals(final Object a, final Object b, Component c) {
        if (a == b) return true;

        final boolean[] ret = new boolean[1];

        try {
            invokeAndWait(new Runnable() { @Override
                                              public void run() {
                                                  synchronized (ret) {
                                                      ret[0] = a.equals(b);
                                                  }
                                              }
            }, c);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        synchronized(ret) { return ret[0]; }
    }

    private static void invokeAndWait(Runnable r, Object o) {
    }
}

with this confix.xml :

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
  <module name="TreeWalker">
    <module name="Indentation">
      <property name="forceStrictCondition" value="true"/>
    </module>
  </module>
</module>

and i get
 ~/gsoc/checkstyle > java -jar target/checkstyle-13.4.3-SNAPSHOT-all.jar -c config.xml Test.java

Starting audit...
[ERROR] /home/carbon14/gsoc/checkstyle/Test.java:11:44: '@' has incorrect indentation level 43, expected level should be 12. [Indentation]
[ERROR] /home/carbon14/gsoc/checkstyle/Test.java:13:51: 'synchronized' has incorrect indentation level 50, expected level should be one of the following: 20, 24. [Indentation]
[ERROR] /home/carbon14/gsoc/checkstyle/Test.java:14:55: 'synchronized' child has incorrect indentation level 54, expected level should be one of the following: 24, 28. [Indentation]
[ERROR] /home/carbon14/gsoc/checkstyle/Test.java:15:51: 'synchronized rcurly' has incorrect indentation level 50, expected level should be one of the following: 20, 24. [Indentation]
[ERROR] /home/carbon14/gsoc/checkstyle/Test.java:16:47: 'method def rcurly' has incorrect indentation level 46, expected level should be one of the following: 16, 20. [Indentation]
Audit done.
Checkstyle ends with 5 errors.

the first violation should not be reported right ?

Please share output in same input but released version of Checkstyle

Let's add this input to tests, bit fix all violations except for line with @

Please share output in same input but released version of Checkstyle

i fixed the input to have only the @ violation

import java.awt.Component;

public class Test {
    public static boolean doEquals(final Object a, final Object b, Component c) {
        if (a == b) return true;
        final boolean[] ret = new boolean[1];
        try {
            invokeAndWait(new Runnable() { @Override
                public void run() {
                    synchronized (ret) {
                        ret[0] = a.equals(b);
                    }
                }
            }, c);
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        synchronized (ret) {
            return ret[0];
        }
    }

    private static void invokeAndWait(Runnable r, Object o) {
    }
}

with latest released we get :

     ~  > java -jar checkstyle-13.4.2-all.jar -c config.xml Test.java 
Starting audit...
[ERROR] /home/carbon14/Test.java:8:44: '@' has incorrect indentation level 43, expected level should be 12. [Indentation]
Audit done.
Checkstyle ends with 1 errors.