DT-743: Project creation, updates fail due to conflicting dependencies

[danepowell]

This is not a BLT bug per se, but an upstream problem with Drupal, webflo/drupal-core-require-dev, and Mink:

• Change of master branch alias to 1.4.x-dev breaks packages depending on 1.3.x-dev minkphp/MinkSelenium2Driver#313
• https://www.drupal.org/project/drupal/issues/3078671

This makes it impossible to create new BLT projects, or to run composer install / update in some circumstances. Errors like this:

Problem 1
    - Installation request for webflo/drupal-core-require-dev 8.7.6 -> satisfiable by webflo/drupal-core-require-dev[8.7.6].
    - webflo/drupal-core-require-dev 8.7.6 requires behat/mink-selenium2-driver 1.3.x-dev -> no matching package found.

The best workaround I see is to add a branch alias as described here: minkphp/MinkSelenium2Driver#313 (comment)

I think end users should do this manually for now while we wait to see how the upstream issues are or aren't resolved, and then BLT can do it via an update hook if necessary.

Long term, we should consider removing webflo to decrease the risk of issues like this: #3838

[josephdpurcell]

If using Lightning 4, see #3840 for a recommendation on how to work around this issue.

[danepowell]

This has been fixed upstream, any users that applied a workaround should remove it.