Fix raw Console markup rendered by ConsoleSectionOutput::overwrite()

[mitrpaka]

Q	A
Branch	2.x
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Documented?	yes (documentation already exists)
Fixed tickets	Did not create a separate bug report for this

While updating recent Drupal core security fix (Symfony were updated to 7.4.12) noticed that markup in the console did not render correctly in a decorated (ANSI) terminal:

Before:

GrumPHP is sniffing your code!

Running tasks with priority 0!
==============================

Running task 1/6: composer... ✔
Running task 2/6: phplint... ✔
Running task 3/6: yamllint... ✔
Running task 4/6: phpcs... ✔

After:

GrumPHP is sniffing your code!

Running tasks with priority 0!
==============================

Running task 1/6: composer... <fg=green>✔</fg=green>
Running task 2/6: phplint... <fg=green>✔</fg=green>
Running task 3/6: yamllint... <fg=green>✔</fg=green>
Running task 4/6: phpcs... <fg=green>✔</fg=green>

Symfony's ConsoleSectionOutput::overwrite() does not pass content through the output formatter. When report() calls overwrite() with raw markup strings like <fg=green>✔</fg=green>, they render as literal text instead of ANSI colour codes.

It seems that the bug was already present but hidden — report() only calls overwrite() when $this->content is non-empty (i.e. after the first task result). The first call always falls back to writeln(), which formats correctly. With 2 or more tasks in a decorated terminal, subsequent calls hit the overwrite() path with unformatted markup.

[veewee]

Thanks! :)