Console section is incorrectly updated #35012
Description
Symfony version(s) affected: 4.3.9, 4.4.1
PHP version: 7.3.12
Description
During alternating updates of individual sections, those previously displayed are incorrectly updated. This is somehow related to the number of lines displayed in between. Change 54 to 53 and then to 52 in for-loop to see the difference.
Invalid output
$ ./bin/console test:output
Section #1 after first overwrite.
Section #2, line #1.
Section #2, line #1.
Section #1 after second overwrite.
Section #2, line #1.
Section #2, line #2.
Section #2, line #3.
Section #2, line #4.
Section #2, line #5.
Test line #0.
Test line #1.
Test line #2.
Test line #3.
Test line #4.
Test line #5.
Test line #6.
Test line #7.
Test line #8.
Test line #9.
Test line #10.
Test line #11.
Test line #12.
Test line #13.
Test line #14.
Test line #15.
Test line #16.
Test line #17.
Test line #18.
Test line #19.
Test line #20.
Test line #21.
Test line #22.
Test line #23.
Test line #24.
Test line #25.
Test line #26.
Test line #27.
Test line #28.
Test line #29.
Test line #30.
Test line #31.
Test line #32.
Test line #33.
Test line #34.
Test line #35.
Test line #36.
Test line #37.
Test line #38.
Test line #39.
Test line #40.
Test line #41.
Test line #42.
Test line #43.
Test line #44.
Test line #45.
Test line #46.
Test line #47.
Test line #48.
Test line #49.
Test line #50.
Test line #51.
Test line #52.
Test line #53.
How to reproduce
<?php
declare(strict_types=1);
namespace App\Command;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\ConsoleOutputInterface;
use Symfony\Component\Console\Output\ConsoleSectionOutput;
use Symfony\Component\Console\Output\OutputInterface;
class OutputTestCommand extends Command
{
protected static $defaultName = 'test:output';
protected function execute(InputInterface $input, OutputInterface $output)
{
/** @var ConsoleOutputInterface $output */
/** @var ConsoleSectionOutput $s1 */
$s1 = $output->section();
$s1->writeln('Section #1, line #1.');
/** @var ConsoleSectionOutput $s2 */
$s2 = $output->section();
for ($i = 1; $i <= 5; $i++) {
$s2->writeln("Section #2, line #$i.");
}
$s1->overwrite('Section #1 after first overwrite.');
$s3 = $output->section();
for ($i = 0; $i < 54; ++$i) {
$s3->writeln("Test line #$i.");
}
// Now the first section will not be updated correctly.
$s1->overwrite('Section #1 after second overwrite.');
}
}