Bug 1730477 - Change SessionStore.getWindowState to return an object instead of a string. r=kashav

Differential Revision: https://phabricator.services.mozilla.com/D125382

browser/components/sessionstore/SessionStore.jsm

@@ -2934,12 +2934,12 @@ var SessionStoreInternal = {
 
   getWindowState: function ssi_getWindowState(aWindow) {
     if ("__SSi" in aWindow) {
-      return JSON.stringify(this._getWindowState(aWindow));
+      return Cu.cloneInto(this._getWindowState(aWindow), {});
     }
 
     if (DyingWindowCache.has(aWindow)) {
       let data = DyingWindowCache.get(aWindow);
-      return JSON.stringify({ windows: [data] });
+      return Cu.cloneInto({ windows: [data] }, {});
     }
 
     throw Components.Exception(

browser/components/sessionstore/test/browser_1446343-windowsize.js

@@ -12,7 +12,7 @@ add_task(async function test() {
 
   const { outerWidth, outerHeight, screenX, screenY } = win;
   function checkCurrentState(sizemode) {
-    let state = JSON.parse(ss.getWindowState(win));
+    let state = ss.getWindowState(win);
     let winState = state.windows[0];
     let msgSuffix = ` should match on ${sizemode} mode`;
     is(winState.width, outerWidth, "width" + msgSuffix);

browser/components/sessionstore/test/browser_662812.js

@@ -7,13 +7,13 @@ function test() {
   window.addEventListener(
     "SSWindowStateBusy",
     function() {
-      let state = JSON.parse(ss.getWindowState(window));
+      let state = ss.getWindowState(window);
       ok(state.windows[0].busy, "window is busy");
 
       window.addEventListener(
         "SSWindowStateReady",
         function() {
-          let state2 = JSON.parse(ss.getWindowState(window));
+          let state2 = ss.getWindowState(window);
           ok(!state2.windows[0].busy, "window is not busy");
 
           executeSoon(() => {

browser/components/sessionstore/test/browser_dying_cache.js

@@ -53,7 +53,7 @@ add_task(async function test() {
 function checkWindowState(window) {
   let {
     windows: [{ tabs }],
-  } = JSON.parse(ss.getWindowState(window));
+  } = ss.getWindowState(window);
   is(tabs.length, 1, "the window has a single tab");
   is(tabs[0].entries[0].url, "about:mozilla", "the tab is about:mozilla");
 

browser/components/sessionstore/test/browser_sizemodeBeforeMinimized.js

@@ -9,7 +9,7 @@ add_task(async function test() {
   }
 
   function checkCurrentState(sizemodeBeforeMinimized) {
-    let state = JSON.parse(ss.getWindowState(win));
+    let state = ss.getWindowState(win);
     let winState = state.windows[0];
     is(
       winState.sizemodeBeforeMinimized,

browser/components/sessionstore/test/browser_windowStateContainer.js

@@ -43,7 +43,7 @@ add_task(async function() {
   // userContextId.
   win.gBrowser.moveTabTo(win.gBrowser.tabs[0], win.gBrowser.tabs.length - 1);
 
-  let winState = JSON.parse(ss.getWindowState(win));
+  let winState = ss.getWindowState(win);
 
   for (let i = 0; i < 4; i++) {
     Assert.equal(
@@ -121,7 +121,7 @@ add_task(async function() {
   // win should have 1 default tab, and 1 container tab.
   Assert.equal(win.gBrowser.tabs.length, 2, "win should have 2 tabs");
 
-  let winState = JSON.parse(ss.getWindowState(win));
+  let winState = ss.getWindowState(win);
 
   for (let i = 0; i < 2; i++) {
     Assert.equal(