Default changed to disallow Layout/TrailingWhitespace in heredoc.

CHANGELOG.md

@@ -15,6 +15,7 @@
 * [#8882](https://github.com/rubocop-hq/rubocop/pull/8882): **(Potentially breaking)** RuboCop assumes that Cop classes do not define new `on_<type>` methods at runtime (e.g. via `extend` in `initialize`). ([@marcandre][])
 * [#7966](https://github.com/rubocop-hq/rubocop/issues/7966): **(Breaking)** Enable all pending cops for RuboCop 1.0. ([@koic][])
 * [#8490](https://github.com/rubocop-hq/rubocop/pull/8490): **(Breaking)** Change logic for cop department name computation. Cops inside deep namespaces (5 or more levels deep) now belong to departments with names that are calculated by joining module names starting from the third one with slashes as separators. For example, cop `Rubocop::Cop::Foo::Bar::Baz` now belongs to `Foo/Bar` department (previously it was `Bar`). ([@dsavochkin][])
+* [#8692](https://github.com/rubocop-hq/rubocop/pull/8692): Default changed to disallow `Layout/TrailingWhitespace` in heredoc. ([@marcandre][])
 
 ## 0.93.1 (2020-10-12)
 

config/default.yml

@@ -1335,7 +1335,7 @@ Layout/TrailingWhitespace:
   Enabled: true
   VersionAdded: '0.49'
   VersionChanged: '0.83'
-  AllowInHeredoc: true
+  AllowInHeredoc: false
 
 #################### Lint ##################################
 ### Warnings

docs/modules/ROOT/pages/cops_layout.adoc

@@ -6360,7 +6360,7 @@ x = 0
 x = 0
 ----
 
-==== AllowInHeredoc: false
+==== AllowInHeredoc: false (default)
 
 [source,ruby]
 ----
@@ -6382,7 +6382,7 @@ code = <<~RUBY
 RUBY
 ----
 
-==== AllowInHeredoc: true (default)
+==== AllowInHeredoc: true
 
 [source,ruby]
 ----
@@ -6399,7 +6399,7 @@ RUBY
 | Name | Default value | Configurable values
 
 | AllowInHeredoc
-| `true`
+| `false`
 | Boolean
 |===
 

lib/rubocop/cop/layout/trailing_whitespace.rb

@@ -14,7 +14,7 @@ module Layout
       #   # good
       #   x = 0
       #
-      # @example AllowInHeredoc: false
+      # @example AllowInHeredoc: false (default)
       #   # The line in this example contains spaces after the 0.
       #   # bad
       #   code = <<~RUBY
@@ -32,7 +32,7 @@ module Layout
       #     x = 0#{trailing_whitespace}
       #   RUBY
       #
-      # @example AllowInHeredoc: true (default)
+      # @example AllowInHeredoc: true
       #   # The line in this example contains spaces after the 0.
       #   # good
       #   code = <<~RUBY