fix(dropdown): fix condition for when position-static is applied (#1477)
fix(dropdown): fix condition for when position-static is applied (#1477)

Class `.position-static` should be applied only when boundary is **not** `scrollParent`
bootstrap-vue/bootstrap-vue,tmorehouse/bootstrap-vue,sschadwick/bootstrap-vue,sschadwick/bootstrap-vue,sschadwick/bootstrap-vue,bootstrap-vue/bootstrap-vue,tmorehouse/bootstrap-vue