This reverts commit 2c9352dd91ebaf37b8a3e3c26fd8e1306df2fb73, reversing
changes made to 18c3e87f1512be2cc50e90235b144b13bc347258.

* 5.4:
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

* 6.4:
  Remove subtree split checks
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

* 7.0:
  Remove subtree split checks
  Revert "minor #54653 Auto-close PRs on subtree-splits (nicolas-grekas)"

…aders

…ized autoloaders (Seldaek)

This PR was merged into the 5.4 branch.

Discussion
----------

Fix autoload configs to avoid warnings when building optimized autoloaders

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #... <!-- prefix each issue number with "Fix #", no need to create an issue if none exists, explain below instead -->
| License       | MIT

The next composer release next week (you can try `composer dump -o` with snapshots right now) warns a bit more about classes which do not match the psr-4 rules they are found in.. Symfony has quite a few false positives there because the rules are using `""` as path for all individual components so all files of the component are scanned by default. I already made sure Composer excludes the vendor dir by default now, and this fixes the rest of the errors I noticed.

Commits
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8882804add Fix autoload configs to avoid warnings when building optimized autoloaders

* 5.4:
  Fix autoload configs to avoid warnings when building optimized autoloaders

* 6.4:
  [Scheduler] Throw an exception when no dispatcher has been passed to a Schedule
  [Mime] Fix TextPart using an unknown File
  Fix autoload configs to avoid warnings when building optimized autoloaders

* 7.0:
  [Scheduler] Throw an exception when no dispatcher has been passed to a Schedule
  [Mime] Fix TextPart using an unknown File
  Fix autoload configs to avoid warnings when building optimized autoloaders

…ts (HypeMC)

This PR was merged into the 5.4 branch.

Discussion
----------

[PhpUnitBridge] Fix error handler triggered outside of tests

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #57071
| License       | MIT

The error handler should be invoked only if the error occurred inside a test.

Commits
-------

348f11a867 [PhpUnitBridge] Fix error handler triggered outside of tests

* 5.4:
  [PhpUnitBridge] Fix error handler triggered outside of tests

* 6.4:
  [PhpUnitBridge] Fix error handler triggered outside of tests

* 7.0:
  [PhpUnitBridge] Fix error handler triggered outside of tests