Remove tabindex prop to pass through as attr

Author: chewy94

src/components/VCheckbox/VCheckbox.js

@@ -66,6 +66,7 @@ export default {
         staticClass: 'v-input--selection-controls__input'
       }, [
         this.genInput('checkbox', {
+          ...this.$attrs,
           'aria-checked': this.inputIndeterminate
             ? 'mixed'
             : this.isActive.toString()

src/components/VInput/VInput.js

@@ -48,7 +48,6 @@ export default {
     /** @deprecated */
     prependIconCb: Function,
     readonly: Boolean,
-    tabindex: { default: 0 },
     value: { required: false }
   },
 

src/components/VSlider/VSlider.js

@@ -247,7 +247,7 @@ export default {
           'aria-label': this.label,
           name: this.name,
           role: 'slider',
-          tabindex: this.disabled ? -1 : undefined,
+          tabindex: this.disabled ? -1 : this.$attrs.tabindex,
           type: 'range',
           value: this.internalValue,
           readonly: true,

src/components/VSwitch/VSwitch.js

@@ -36,7 +36,7 @@ export default {
       return this.$createElement('div', {
         staticClass: 'v-input--selection-controls__input'
       }, [
-        this.genInput('checkbox'),
+        this.genInput('checkbox', this.$attrs),
         !this.disabled && this.genRipple({
           'class': this.classesSelectable,
           directives: [{

src/components/VTextField/VTextField.js

@@ -318,7 +318,6 @@ export default {
           autofocus: this.autofocus,
           disabled: this.disabled,
           readonly: this.readonly,
-          tabindex: this.tabindex,
           type: this.type,
           'aria-label': (!this.$attrs || !this.$attrs.id) && this.label // Label `for` will be set if we have an id
         },