Save sidebar state per session (#1619)

Only restore close state.
Sidebar will still auto close on window resize.

assets/js/sidebar/sidebar-drawer.js

@@ -40,6 +40,12 @@ export function initialize () {
 }
 
 function setDefaultSidebarState () {
+ // check & set persistent session state
+ const persistentSessionState = sessionStorage.getItem('sidebar_state')
+ // set default for closed state only, so sidebar will still auto close on window resize
+ if (persistentSessionState === 'closed') return setClass(SIDEBAR_CLASS.closed)
+
+ // else
  setClass(isScreenSmall() ? SIDEBAR_CLASS.closed : SIDEBAR_CLASS.opened)
 }
 
@@ -98,6 +104,7 @@ function isSidebarOpen () {
 export function openSidebar () {
  clearTimeoutIfAny()
  setClass(SIDEBAR_CLASS.opening)
+ sessionStorage.setItem('sidebar_state', 'opened')
 
  return new Promise((resolve, reject) => {
  state.togglingTimeout = setTimeout(() => {
@@ -115,6 +122,7 @@ export function openSidebar () {
 export function closeSidebar () {
  clearTimeoutIfAny()
  setClass(SIDEBAR_CLASS.closing)
+ sessionStorage.setItem('sidebar_state', 'closed')
 
  return new Promise((resolve, reject) => {
  state.togglingTimeout = setTimeout(() => {