### New features

* [#11561](https://github.com/rubocop/rubocop/pull/11561): Add new `Lint/MixedCaseRange` cop. ([@rwstauner][])
* [#11565](https://github.com/rubocop/rubocop/pull/11565): Add new `Lint/RedundantRegexpQuantifiers` cop. ([@jaynetics][])
* [#11925](https://github.com/rubocop/rubocop/issues/11925): Add new `Style/RedundantCurrentDirectoryInPath` cop. ([@koic][])
* [#11595](https://github.com/rubocop/rubocop/pull/11595): Add new `Style/RedundantRegexpArgument` cop. ([@koic][])
* [#11967](https://github.com/rubocop/rubocop/pull/11967): Add new `Style/ReturnNilInPredicateMethodDefinition` cop. ([@koic][])
* [#11745](https://github.com/rubocop/rubocop/pull/11745): Add new `Style/YAMLFileRead` cop. ([@koic][])
* [#11926](https://github.com/rubocop/rubocop/pull/11926): Support built-in LSP server. ([@koic][])

### Bug fixes

* [#11953](https://github.com/rubocop/rubocop/issues/11953): Fix a false negative for `Lint/DuplicateHashKey` when there is a duplicated constant key in the hash literal. ([@koic][])
* [#11945](https://github.com/rubocop/rubocop/issues/11945): Fix a false negative for `Style/RedundantSelfAssignmentBranch` when using method chaining or arguments in ternary branch. ([@koic][])
* [#11949](https://github.com/rubocop/rubocop/issues/11949): Fix a false positive for `Layout/RedundantLineBreak` when using a line broken string. ([@koic][])
* [#11931](https://github.com/rubocop/rubocop/pull/11931): Fix a false positive for `Lint/RedundantRequireStatement` when using `PP.pp`. ([@koic][])
* [#11946](https://github.com/rubocop/rubocop/pull/11946): Fix an error for `Lint/NumberConversion` when using multiple number conversion methods. ([@koic][])
* [#11972](https://github.com/rubocop/rubocop/issues/11972): Fix an error for `Lint/Void` when `CheckForMethodsWithNoSideEffects: true` and using a method definition. ([@koic][])
* [#11958](https://github.com/rubocop/rubocop/pull/11958): Fix error for `Style/IdenticalConditionalBranches` when using empty parentheses in the `if` branch. ([@koic][])
* [#11962](https://github.com/rubocop/rubocop/issues/11962): Fix an error for `Style/RedundantStringEscape` when an escaped double quote precedes interpolation in a symbol literal. ([@koic][])
* [#11947](https://github.com/rubocop/rubocop/issues/11947): Fix an error for `Style/ConditionalAssignment` with an assignment that uses `if` branch bodies, which include a block. ([@koic][])
* [#11959](https://github.com/rubocop/rubocop/pull/11959): Fix false negatives for `Layout/EmptyLinesAroundExceptionHandlingKeywords` when using Ruby 2.5's `rescue` inside block and Ruby 2.7's numbered block. ([@koic][])
* [#10902](https://github.com/rubocop/rubocop/issues/10902): Fix an error for `Style/RedundantRegexpEscape` string with invalid byte sequence in UTF-8. ([@ydah][])
* [#11562](https://github.com/rubocop/rubocop/pull/11562): Fixed escaped octal handling and detection in `Lint/DuplicateRegexpCharacterClassElement`. ([@rwstauner][])

### Changes

* [#11904](https://github.com/rubocop/rubocop/pull/11904): Mark `Layout/ClassStructure` as unsafe to autocorrect. ([@nevans][])
* [#8506](https://github.com/rubocop/rubocop/issues/8506): Add `AllowedParentClasses` config to `Lint/MissingSuper`. ([@iMacTia][])

[@rwstauner]: https://github.com/rwstauner
[@jaynetics]: https://github.com/jaynetics
[@koic]: https://github.com/koic
[@ydah]: https://github.com/ydah
[@nevans]: https://github.com/nevans
[@iMacTia]: https://github.com/iMacTia
