[Fix #12758] Fix false positives for Layout/RedundantLineBreak

Fixes #12758.

This PR fixes false positives for `Layout/RedundantLineBreak`
when using `&&` or `||` after a backslash newline.

changelog/fix_false_positive_for_layout_redundant_line_break.md

@@ -0,0 +1 @@
+* [#12758](https://github.com/rubocop/rubocop/issues/12758): Fix false positives for `Layout/RedundantLineBreak` when using `&&` or `||` after a backslash newline. ([@koic][])

lib/rubocop/cop/layout/redundant_line_break.rb

@@ -84,8 +84,14 @@ def register_offense(node)
         end
 
         def offense?(node)
-          node.multiline? && !too_long?(node) && suitable_as_single_line?(node) &&
-            !index_access_call_chained?(node) && !configured_to_not_be_inspected?(node)
+          return false if !node.multiline? || too_long?(node) || !suitable_as_single_line?(node)
+          return require_backslash?(node) if node.and_type? || node.or_type?
+
+          !index_access_call_chained?(node) && !configured_to_not_be_inspected?(node)
+        end
+
+        def require_backslash?(node)
+          processed_source.lines[node.loc.operator.line - 1].end_with?('\\')
         end
 
         def index_access_call_chained?(node)

spec/rubocop/cop/layout/redundant_line_break_spec.rb

@@ -172,6 +172,44 @@
         RUBY
       end
 
+      it 'registers an offense when using `&&` before a backslash newline' do
+        expect_offense(<<~RUBY)
+          foo && \\
+          ^^^^^^^^ Redundant line break detected.
+            bar
+        RUBY
+
+        expect_correction(<<~RUBY)
+          foo && bar
+        RUBY
+      end
+
+      it 'does not register an offense when using `&&` after a backslash newline' do
+        expect_no_offenses(<<~RUBY)
+          foo \\
+            && bar
+        RUBY
+      end
+
+      it 'registers an offense when using `||` before a backslash newline' do
+        expect_offense(<<~RUBY)
+          foo || \\
+          ^^^^^^^^ Redundant line break detected.
+            bar
+        RUBY
+
+        expect_correction(<<~RUBY)
+          foo || bar
+        RUBY
+      end
+
+      it 'does not register an offense when using `||` after a backslash newline' do
+        expect_no_offenses(<<~RUBY)
+          foo \\
+            || bar
+        RUBY
+      end
+
       context 'with LineLength Max 100' do
         let(:max_line_length) { 100 }