…ocompleter (Mikkel Paulson)This PR was merged into the 4.3-dev branch.Discussion----------[Console] Add callback support to Console\Question autocompleter| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | no| New feature?  | yes| BC breaks?    | minor edge case, see below| Deprecations? | no| Tests pass?   | yes (with expanded coverage)| Fixed tickets | N/A| License       | MIT| Doc PR        |symfony/symfony-docs#11349Autocompletion is a useful feature, but it's not always possible to anticipate every input the user could provide in advance. For instance, if we're allowing the user to input a path to a file, it's not practical to populate an array with every file and directory in the filesystem, but we can easily build a callback function that populates its suggestions based on the path already inputted.This change replaces the autocomplete logic that accepts an array of suggestions with an architecture that uses a callback function to populate suggestions in real time as the user provides input.The first commit adds a test class covering all methods of the `Question` object, while the second commit modifies the `Question` object to accept and store a callback function. The existing `[gs]etAutocompleterValues()` methods are preserved, but instead of being referenced directly from the `QuestionHelper`, they create and call their own callbacks to emulate the current behaviour.There is one edge case that is changed, as documented in the test: when a `Traversable` object is passed to `setAutocompleterValues()`, the return value of `getAutocompleterValues()` will be the unpacked (array) form of that object rather than the object itself. The unpacking is done lazily and cached on the callback function.Commits-------caad562 [Console] Add callback support to Console\Question autocompleter

This PR was merged into the master branch.Discussion----------Add description of autocompleter callbackDocumented feature added bysymfony/symfony#30997.Commits-------5cfc67e Add description of autocompleter callback

This PR was merged into the 4.3-dev branch.Discussion----------Improve test coverage from#30997| Q             | A| ------------- | ---| Branch?       | master| Bug fix?      | yes (test enhancement against change on master)| New feature?  | no| BC breaks?    | no| Deprecations? | no| Tests pass?   | yes| Fixed tickets | enhancement for#30997| License       | MIT| Doc PR        | N/ATest coverage added in#30997 did a good job of validating previous behaviour, but didn't adequately cover the new callback logic. Added coverage for new methods on the Question object.Commits-------4693422 Improve test coverage from#30997