chore: awlays has root of rc-mentions prefixCls

Author: zombieJ

src/Mentions.tsx

@@ -605,7 +605,7 @@ const Mentions = forwardRef<MentionsRef, MentionsProps>(
         value={mergedValue}
         allowClear={allowClear}
         handleReset={handleReset}
-        className={className}
+        className={clsx(prefixCls, className)}
         classNames={mentionsClassNames}
         disabled={disabled}
         ref={holderRef}

tests/__snapshots__/AllowClear.spec.tsx.snap

@@ -2,7 +2,7 @@
 
 exports[`should support allowClear should not show icon if defaultValue is undefined, null or empty string 1`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"
@@ -24,7 +24,7 @@ exports[`should support allowClear should not show icon if defaultValue is undef
 
 exports[`should support allowClear should not show icon if defaultValue is undefined, null or empty string 2`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"
@@ -46,7 +46,7 @@ exports[`should support allowClear should not show icon if defaultValue is undef
 
 exports[`should support allowClear should not show icon if defaultValue is undefined, null or empty string 3`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"
@@ -68,7 +68,7 @@ exports[`should support allowClear should not show icon if defaultValue is undef
 
 exports[`should support allowClear should not show icon if value is undefined, null or empty string 1`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"
@@ -90,7 +90,7 @@ exports[`should support allowClear should not show icon if value is undefined, n
 
 exports[`should support allowClear should not show icon if value is undefined, null or empty string 2`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"
@@ -112,7 +112,7 @@ exports[`should support allowClear should not show icon if value is undefined, n
 
 exports[`should support allowClear should not show icon if value is undefined, null or empty string 3`] = `
 <span
-  class="rc-mentions-affix-wrapper"
+  class="rc-mentions-affix-wrapper rc-mentions"
 >
   <textarea
     class="rc-textarea"