handle multiple body scroll lockers

src/directives/body_scroll_lock.js

@@ -2,13 +2,18 @@ import * as bodyScrollLock from 'body-scroll-lock'
 
 let previousNavPaddingRight
 let previousAppBgWrapperRight
+let lockerEls = []
 
 const disableBodyScroll = (el) => {
   const scrollBarGap = window.innerWidth - document.documentElement.clientWidth
   bodyScrollLock.disableBodyScroll(el, {
     reserveScrollBarGap: true
   })
+  if (!lockerEls.includes(el)) {
+    lockerEls.push(el)
+  }
   setTimeout(() => {
+    if (lockerEls.length <= 1) {
       // If previousNavPaddingRight is already set, don't set it again.
       if (previousNavPaddingRight === undefined) {
         const navEl = document.getElementById('nav')
@@ -22,11 +27,16 @@ const disableBodyScroll = (el) => {
         appBgWrapperEl.style.right = previousAppBgWrapperRight ? `calc(${previousAppBgWrapperRight} + ${scrollBarGap}px)` : `${scrollBarGap}px`
       }
       document.body.classList.add('scroll-locked')
+    }
   })
 }
 
 const enableBodyScroll = (el) => {
+  if (lockerEls.includes(el)) {
+    lockerEls = lockerEls.filter(e => e !== el)
+  }
   setTimeout(() => {
+    if (!lockerEls.length) {
       if (previousNavPaddingRight !== undefined) {
         document.getElementById('nav').style.paddingRight = previousNavPaddingRight
         // Restore previousNavPaddingRight to undefined so disableBodyScroll knows it can be set again.
@@ -38,6 +48,7 @@ const enableBodyScroll = (el) => {
         previousAppBgWrapperRight = undefined
       }
       document.body.classList.remove('scroll-locked')
+    }
   })
   bodyScrollLock.enableBodyScroll(el)
 }