feat(cli): allow multiple reverses (#488)

* Permit multiple reverses

* chore(docs): add changelog entry

---------

Co-authored-by: Jérome Eertmans <jeertmans@icloud.com>

CHANGELOG.md

@@ -17,6 +17,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   HTML presentations.
   [#440](https://github.com/jeertmans/manim-slides/pull/440)
 
+(unreleased-changed)=
+### Changed
+
+- Allow multiple slide reverses by going backward [@PeculiarProgrammer](https://github.com/PeculiarProgrammer).
+  [#488](https://github.com/jeertmans/manim-slides/pull/488)
+
 (v5.1.9)=
 ## [v5.1.9](https://github.com/jeertmans/manim-slides/compare/v5.1.8...v5.1.9)
 

manim_slides/present/player.py

@@ -515,6 +515,9 @@ class Player(QMainWindow):  # type: ignore[misc]
 
     @Slot()
     def reverse(self) -> None:
+        if self.playing_reversed_slide and self.current_slide_index >= 1:
+            self.current_slide_index -= 1
+
         self.load_reversed_slide()
         self.preview_next_slide()