Bump license years for 2018

Clarify that it's public API and may be used in third-party analyzers.

Clarify that it's public API intended for use by third-party previewers. It shouldn't be removed without deprecation even though it isn't used by the built-in previewers.

Bugfix foreign key replacement in inverse association

Duration created with no parts will have a default seconds part eqaul to 0

Fixes analyzing an SVG image without an XML declaration. ImageMagick occasionally looks to the extension when it can't discern the type of an image file from its contents.

References #31356.

Fix recreating partial indexes after alter table for sqlite

Clarify that config.eager_load controls eager loading [ci skip]

Before Rails 4.0, `config.cache_classes` determined whether application
code was eager loaded. The `config.eager_load` option was introduced to
allow the two behaviours to be configured independently, but this
documentation was never updated to reflect that change.

We can't replace existing SELECT list as long as having DISTINCT, it
will cause incorrect result.

And also, PostgreSQL has a limitation that ORDER BY expressions must
appear in select list for SELECT DISTINCT.

Therefore, we should not replace existing SELECT list when using
DISTINCT.

Fixes #29779.

This broke the doc.

Allow the use of callable objects as group methods for grouped selects.

let drb make temprary server

Ref: https://github.com/collectiveidea/delayed_job/blob/master/CHANGELOG.md#414---2017-12-29

We can't replace existing select list as long as referenced by ORDER BY.

Fix IE 10 and IE 11's broken `preventDefault` for rails-ujs

* `assert_header` and `assert_body` were unused since 6f6a589d.
* `assert_success` and `assert_missing` were unused since added.

Replaced the uses of `group.send(...)` in `option_groups_from_collection_for_select`
by calls to `value_for_collection(group, ...)`, allowing the use of
procs, lambdas and other callable objects as parameters.

when model is added to collection association

https://github.com/turbolinks/turbolinks/issues/233
https://stackoverflow.com/questions/23349191/event-preventdefault-is-not-working-in-ie-11-for-custom-events

Update "Action View Overview" guide [ci skip]

CI against ruby 2.5.0

  - Provide full / Fix generated HTML by `form_for` in the example.
  - Provide full params in the example.
  - Express params[:person] in the sentence.

Originally I tried to add `assert_equal pk.sql_type, ref.sql_type`. But
the assert failed even though the same type due to `sql_type` of primary
key in SQLite is upper case. Prefer lower case like other types.

Fix `add_column` with :primary_key type compatibility for SQLite

`invoke_all` cause `bundle install`. This will install gems actually
defined in `Gemfile`. To avoid this, stubbed `bundle_command`.

Fixes #31557

Prevent shadowing outer variables

And prefer `assert_same` over `assert_equal`.

Try to update rubygems 2.7.4