fix(b-modal): delay initially open modal via nextTick when using v-model or visible prop (#3320)
fix(b-modal): delay initially open modal via nextTick when using v-model or visible prop (#3320)

* fix(modal): delay initially open modal via nextTick when using v-model or visible prop


When modal is set to be initially open on mount, delay the show in a `$nextTick()` to ensure DOM is fully loaded

Addresses https://github.com/bootstrap-vue/bootstrap-vue/issues/3312#issuecomment-493389988

* Update modal.js

* Update modal.js

tmorehouse/bootstrap-vue,tmorehouse/bootstrap-vue,bootstrap-vue/bootstrap-vue,bootstrap-vue/bootstrap-vue