From 293aca9c7aa20ec5b99bbe1130237fa6b7ee758d Mon Sep 17 00:00:00 2001
From: Joe Anderson <joe@mousetrapped.co.uk>
Date: Mon, 2 Jun 2025 15:43:28 +0100
Subject: [PATCH] Fix backspace for Bengali grapheme clusters (#5887)

---
 .changeset/grumpy-walls-look.md                   | 5 +++++
 packages/slate/src/transforms-text/delete-text.ts | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)
 create mode 100644 .changeset/grumpy-walls-look.md

diff --git a/.changeset/grumpy-walls-look.md b/.changeset/grumpy-walls-look.md
new file mode 100644
index 000000000..28323da3b
--- /dev/null
+++ b/.changeset/grumpy-walls-look.md
@@ -0,0 +1,5 @@
+---
+'slate': patch
+---
+
+Handle backspace correctly for grapheme clusters in Bengali
diff --git a/packages/slate/src/transforms-text/delete-text.ts b/packages/slate/src/transforms-text/delete-text.ts
index ce2aa62c4..b990340ba 100644
--- a/packages/slate/src/transforms-text/delete-text.ts
+++ b/packages/slate/src/transforms-text/delete-text.ts
@@ -169,15 +169,17 @@ export const deleteText: TextTransforms['delete'] = (editor, options = {}) => {
       })
     }
 
-    // For Thai script, deleting N character(s) backward should delete
+    // For certain scripts, deleting N character(s) backward should delete
     // N code point(s) instead of an entire grapheme cluster.
     // Therefore, the remaining code points should be inserted back.
+    // Bengali: \u0980-\u09FF
+    // Thai: \u0E00-\u0E7F
     if (
       isCollapsed &&
       reverse &&
       unit === 'character' &&
       removedText.length > 1 &&
-      removedText.match(/[\u0E00-\u0E7F]+/)
+      removedText.match(/[\u0980-\u09FF\u0E00-\u0E7F]+/)
     ) {
       Transforms.insertText(
         editor,