fix(VSlideGroup): always hide arrows when prop is false

fixes #14586

packages/vuetify/src/components/VSlideGroup/VSlideGroup.ts

@@ -21,6 +21,7 @@ import mixins, { ExtractVue } from '../../util/mixins'
 // Types
 import Vue, { VNode } from 'vue'
 import { composedPath } from '../../util/helpers'
+import { PropType } from 'vue/types/options'
 
 interface TouchEvent {
   touchstartX: number
@@ -126,8 +127,10 @@ export const BaseSlideGroup = mixins<options &
       default: '$prev',
     },
     showArrows: {
-      type: [Boolean, String],
+      type: [Boolean, String] as PropType<boolean | string | undefined>,
+      default: undefined,
       validator: v => (
+        v === undefined ||
         typeof v === 'boolean' || [
           'always',
           'desktop',
@@ -187,6 +190,9 @@ export const BaseSlideGroup = mixins<options &
           (this.isOverflowing || Math.abs(this.scrollOffset) > 0)
         )
 
+        // Always hide arrows
+        case false: return false
+
         // https://material.io/components/tabs#scrollable-tabs
         // Always show arrows when
         // overflowed on desktop