fix(VDialog): properly check for activator scopedSlot

fixes #6115

packages/vuetify/src/components/VDialog/VDialog.js

@@ -84,6 +84,12 @@ export default {
         'v-dialog__content': true,
         'v-dialog__content--active': this.isActive
       }
+    },
+    hasActivator () {
+      return Boolean(
+        !!this.$slots.activator ||
+        !!this.$scopedSlots.activator
+      )
     }
   },
 
@@ -177,7 +183,7 @@ export default {
       this.$emit('keydown', e)
     },
     genActivator () {
-      if (!this.$slots.activator && !this.$scopedSlots.activator) return null
+      if (!this.hasActivator) return null
 
       const listeners = this.disabled ? {} : {
         click: e => {
@@ -263,7 +269,7 @@ export default {
     return h('div', {
       staticClass: 'v-dialog__container',
       style: {
-        display: (!this.$slots.activator || this.fullWidth) ? 'block' : 'inline-block'
+        display: (!this.hasActivator || this.fullWidth) ? 'block' : 'inline-block'
       }
     }, children)
   }

packages/vuetify/test/unit/components/VDialog/VDialog.spec.js

@@ -1,5 +1,6 @@
 import VDialog from '@/components/VDialog'
 import { test } from '@/test'
+import Vue from 'vue'
 
 test('VDialog.js', ({ mount, compileToFunctions }) => {
   it('should render component and match snapshot', () => {
@@ -230,4 +231,32 @@ test('VDialog.js', ({ mount, compileToFunctions }) => {
 
     expect('Unable to locate target [data-app]').toHaveBeenTipped()
   })
+
+  // https://github.com/vuetifyjs/vuetify/issues/6115
+  it('should have activator', () => {
+    const wrapper = mount(VDialog)
+    expect(wrapper.vm.hasActivator).toBe(false)
+    expect(wrapper.hasStyle('display', 'block')).toBe(true)
+
+    const wrapper2 = mount(VDialog, {
+      slots: {
+        activator: [compileToFunctions('<div></div>')]
+      }
+    })
+    expect(wrapper2.hasStyle('display', 'inline-block')).toBe(true)
+    expect(wrapper2.vm.hasActivator).toBe(true)
+
+    const wrapper3 = mount({
+      render: h => h(VDialog, {
+        scopedSlots: {
+          activator: () => '<div></div>'
+        }
+      })
+    })
+    const dialog = wrapper3.first(VDialog)
+    expect(dialog.hasStyle('display', 'inline-block')).toBe(true)
+    expect(dialog.vm.hasActivator).toBe(true)
+
+    expect('Unable to locate target [data-app]').toHaveBeenTipped()
+  })
 })