[@mantine/core] TagsInput: Fix incorrect IME keyboard input handling …

…for `Backspace` key (#6011)

When people use IME to type in CJK words, a `Backspace` key would delete both a
char in the CJK words and the previous tag before this fix.

Ref PR: #4947

packages/@mantine/core/src/components/TagsInput/TagsInput.tsx

@@ -277,7 +277,12 @@ export const TagsInput = factory<TagsInputFactory>((_props, ref) => {
       }
     }
 
-    if (event.key === 'Backspace' && length === 0 && _value.length > 0) {
+    if (
+      event.key === 'Backspace' &&
+      length === 0 &&
+      _value.length > 0 &&
+      !event.nativeEvent.isComposing
+    ) {
       onRemove?.(_value[_value.length - 1]);
       setValue(_value.slice(0, _value.length - 1));
     }